Important

This documentation covers IPython versions 6.0 and higher. Beginning with version 6.0, IPython stopped supporting compatibility with Python versions lower than 3.3 including all versions of Python 2.7.

If you are looking for an IPython version compatible with Python 2.7, please use the IPython 5.x LTS release and refer to its documentation (LTS is the long term support release).

Built-in magic commands

Note

To Jupyter users: Magics are specific to and provided by the IPython kernel. Whether Magics are available on a kernel is a decision that is made by the kernel developer on a per-kernel basis. To work properly, Magics must use a syntax element which is not valid in the underlying language. For example, the IPython kernel uses the % syntax element for Magics as % is not a valid unary operator in Python. However, % might have meaning in other languages.

Here is the help auto-generated from the docstrings of all the available Magics functions that IPython ships with.

You can create and register your own Magics with IPython. You can find many user defined Magics on PyPI. Feel free to publish your own and use the Framework :: IPython trove classifier.

Line magics

%alias

Define an alias for a system command.

‘%alias alias_name cmd’ defines ‘alias_name’ as an alias for ‘cmd’

Then, typing ‘alias_name params’ will execute the system command ‘cmd params’ (from your underlying operating system).

Aliases have lower precedence than magic functions and Python normal variables, so if ‘foo’ is both a Python variable and an alias, the alias can not be executed until ‘del foo’ removes the Python variable.

You can use the %l specifier in an alias definition to represent the whole line when the alias is called. For example:

In [2]: alias bracket echo "Input in brackets: <%l>"
In [3]: bracket hello world
Input in brackets: <hello world>

You can also define aliases with parameters using %s specifiers (one per parameter):

In [1]: alias parts echo first %s second %s
In [2]: %parts A B
first A second B
In [3]: %parts A
Incorrect number of arguments: 2 expected.
parts is an alias to: 'echo first %s second %s'

Note that %l and %s are mutually exclusive. You can only use one or the other in your aliases.

Aliases expand Python variables just like system calls using ! or !! do: all expressions prefixed with ‘$’ get expanded. For details of the semantic rules, see PEP-215: https://peps.python.org/pep-0215/. This is the library used by IPython for variable expansion. If you want to access a true shell variable, an extra $ is necessary to prevent its expansion by IPython:

In [6]: alias show echo
In [7]: PATH='A Python string'
In [8]: show $PATH
A Python string
In [9]: show $$PATH
/usr/local/lf9560/bin:/usr/local/intel/compiler70/ia32/bin:...

You can use the alias facility to access all of $PATH. See the %rehashx function, which automatically creates aliases for the contents of your $PATH.

If called with no parameters, %alias prints the current alias table for your system. For posix systems, the default aliases are ‘cat’, ‘cp’, ‘mv’, ‘rm’, ‘rmdir’, and ‘mkdir’, and other platform-specific aliases are added. For windows-based systems, the default aliases are ‘copy’, ‘ddir’, ‘echo’, ‘ls’, ‘ldir’, ‘mkdir’, ‘ren’, and ‘rmdir’.

You can see the definition of alias by adding a question mark in the end:

In [1]: cat?
Repr: <alias cat for 'cat'>
%alias_magic
%alias_magic [-l] [-c] [-p PARAMS] name target

Create an alias for an existing line or cell magic.

Examples

In [1]: %alias_magic t timeit
Created `%t` as an alias for `%timeit`.
Created `%%t` as an alias for `%%timeit`.

In [2]: %t -n1 pass
107 ns ± 43.6 ns per loop (mean ± std. dev. of 7 runs, 1 loop each)

In [3]: %%t -n1
   ...: pass
   ...:
107 ns ± 58.3 ns per loop (mean ± std. dev. of 7 runs, 1 loop each)

In [4]: %alias_magic --cell whereami pwd
UsageError: Cell magic function `%%pwd` not found.
In [5]: %alias_magic --line whereami pwd
Created `%whereami` as an alias for `%pwd`.

In [6]: %whereami
Out[6]: '/home/testuser'

In [7]: %alias_magic h history -p "-l 30" --line
Created `%h` as an alias for `%history -l 30`.
positional arguments:

name Name of the magic to be created. target Name of the existing line or cell magic.

options:
-l, --line

Create a line magic alias.

-c, --cell

Create a cell magic alias.

-p PARAMS, --params PARAMS

Parameters passed to the magic function.

%autoawait

Allow to change the status of the autoawait option.

This allow you to set a specific asynchronous code runner.

If no value is passed, print the currently used asynchronous integration and whether it is activated.

It can take a number of value evaluated in the following order:

  • False/false/off deactivate autoawait integration

  • True/true/on activate autoawait integration using configured default loop

  • asyncio/curio/trio activate autoawait integration and use integration with said library.

  • sync turn on the pseudo-sync integration (mostly used for IPython.embed() which does not run IPython with a real eventloop and deactivate running asynchronous code. Turning on Asynchronous code with the pseudo sync loop is undefined behavior and may lead IPython to crash.

If the passed parameter does not match any of the above and is a python identifier, get said object from user namespace and set it as the runner, and activate autoawait.

If the object is a fully qualified object name, attempt to import it and set it as the runner, and activate autoawait.

The exact behavior of autoawait is experimental and subject to change across version of IPython and Python.

%autocall

Make functions callable without having to type parentheses.

Usage:

%autocall [mode]

The mode can be one of: 0->Off, 1->Smart, 2->Full. If not given, the value is toggled on and off (remembering the previous state).

In more detail, these values mean:

0 -> fully disabled

1 -> active, but do not apply if there are no arguments on the line.

In this mode, you get:

In [1]: callable
Out[1]: <built-in function callable>

In [2]: callable 'hello'
------> callable('hello')
Out[2]: False

2 -> Active always. Even if no arguments are present, the callable object is called:

In [2]: float
------> float()
Out[2]: 0.0

Note that even with autocall off, you can still use ‘/’ at the start of a line to treat the first argument on the command line as a function and add parentheses to it:

In [8]: /str 43
------> str(43)
Out[8]: '43'

# all-random (note for auto-testing)

%automagic

Make magic functions callable without having to type the initial %.

Without arguments toggles on/off (when off, you must call it as %automagic, of course). With arguments it sets the value, and you can use any of (case insensitive):

  • on, 1, True: to activate

  • off, 0, False: to deactivate.

Note that magic functions have lowest priority, so if there’s a variable whose name collides with that of a magic fn, automagic won’t work for that function (you get the variable instead). However, if you delete the variable (del var), the previously shadowed magic function becomes visible to automagic again.

%bookmark

Manage IPython’s bookmark system.

%bookmark <name> - set bookmark to current dir %bookmark <name> <dir> - set bookmark to <dir> %bookmark -l - list all bookmarks %bookmark -d <name> - remove bookmark %bookmark -r - remove all bookmarks

You can later on access a bookmarked folder with:

%cd -b <name>

or simply ‘%cd <name>’ if there is no directory called <name> AND there is such a bookmark defined.

Your bookmarks persist through IPython sessions, but they are associated with each profile.

%cd

Change the current working directory.

This command automatically maintains an internal list of directories you visit during your IPython session, in the variable _dh. The command %dhist shows this history nicely formatted. You can also do cd -<tab> to see directory history conveniently. Usage:

  • cd 'dir': changes to directory ‘dir’.

  • cd -: changes to the last visited directory.

  • cd -<n>: changes to the n-th directory in the directory history.

  • cd --foo: change to directory that matches ‘foo’ in history

  • cd -b <bookmark_name>: jump to a bookmark set by %bookmark

  • Hitting a tab key after cd -b allows you to tab-complete bookmark names.

Note

cd <bookmark_name> is enough if there is no directory <bookmark_name>, but a bookmark with the name exists.

Options:

-q

Be quiet. Do not print the working directory after the cd command is executed. By default IPython’s cd command does print this directory, since the default prompts do not display path information.

Note

Note that !cd doesn’t work for this purpose because the shell where !command runs is immediately discarded after executing ‘command’.

Examples

In [10]: cd parent/child
/home/tsuser/parent/child
%code_wrap
%code_wrap [--remove] [--list] [--list-all] [name]

Simple magic to quickly define a code transformer for all IPython’s future input.

__code__ and __ret__ are special variable that represent the code to run and the value of the last expression of __code__ respectively.

Examples

In [1]: %%code_wrap before_after
   ...: print('before')
   ...: __code__
   ...: print('after')
   ...: __ret__
   ...: 

In [2]: 1
before
after
Out[2]: 1

In [3]: %code_wrap --list
before
before_after
after

In [4]: %code_wrap --list-all
before
before_after :
    print('before')
    __code__
    print('after')
    __ret__

after

In [5]: %code_wrap --remove before_after
before
after
positional arguments:

name

options:
--remove

remove the current transformer

--list

list existing transformers name

--list-all

list existing transformers name and code template

%colors

Switch color scheme for prompts, info system and exception handlers.

Currently implemented schemes: NoColor, Linux, LightBG.

Color scheme names are not case-sensitive.

Examples

To get a plain black and white terminal:

%colors nocolor
%conda

Run the conda package manager within the current kernel.

Usage:

%conda install [pkgs]

%config

configure IPython

%config Class[.trait=value]

This magic exposes most of the IPython config system. Any Configurable class should be able to be configured with the simple line:

%config Class.trait=value

Where value will be resolved in the user’s namespace, if it is an expression or variable name.

Examples

To see what classes are available for config, pass no arguments:

In [1]: %config
Available objects for config:
    AliasManager
    DisplayFormatter
    HistoryManager
    IPCompleter
    LoggingMagics
    MagicsManager
    OSMagics
    PrefilterManager
    ScriptMagics
    TerminalInteractiveShell

To view what is configurable on a given class, just pass the class name:

In [2]: %config LoggingMagics
LoggingMagics(Magics) options

LoggingMagics.quiet=<Bool>
    Suppress output of log state when logging is enabled
    Current: False

but the real use is in setting values:

In [3]: %config LoggingMagics.quiet = True

and these values are read from the user_ns if they are variables:

In [4]: feeling_quiet=False

In [5]: %config LoggingMagics.quiet = feeling_quiet
%debug
%debug [--breakpoint FILE:LINE] [statement ...]

Activate the interactive debugger.

This magic command support two ways of activating debugger. One is to activate debugger before executing code. This way, you can set a break point, to step through the code from the point. You can use this mode by giving statements to execute and optionally a breakpoint.

The other one is to activate debugger in post-mortem mode. You can activate this mode simply running %debug without any argument. If an exception has just occurred, this lets you inspect its stack frames interactively. Note that this will always work only on the last traceback that occurred, so you must call this quickly after an exception that you wish to inspect has fired, because if another one occurs, it clobbers the previous one.

If you want IPython to automatically do this on every exception, see the %pdb magic for more details.

Changed in version 7.3: When running code, user variables are no longer expanded, the magic line is always left unmodified.

positional arguments:

statement Code to run in debugger. You can omit this in cell magic mode.

options:
--breakpoint <FILE:LINE>, -b <FILE:LINE>

Set break point at LINE in FILE.

%dhist

Print your history of visited directories.

%dhist -> print full history%dhist n -> print last n entries only%dhist n1 n2 -> print entries between n1 and n2 (n2 not included)

This history is automatically maintained by the %cd command, and always available as the global list variable _dh. You can use %cd -<n> to go to directory number <n>.

Note that most of time, you should view directory history by entering cd -<TAB>.

%dirs

Return the current directory stack.

%doctest_mode

Toggle doctest mode on and off.

This mode is intended to make IPython behave as much as possible like a plain Python shell, from the perspective of how its prompts, exceptions and output look. This makes it easy to copy and paste parts of a session into doctests. It does so by:

  • Changing the prompts to the classic >>> ones.

  • Changing the exception reporting mode to ‘Plain’.

  • Disabling pretty-printing of output.

Note that IPython also supports the pasting of code snippets that have leading ‘>>>’ and ‘…’ prompts in them. This means that you can paste doctests from files or docstrings (even if they have leading whitespace), and the code will execute correctly. You can then use ‘%history -t’ to see the translated history; this will give you the input after removal of all the leading prompts and whitespace, which can be pasted back into an editor.

With these features, you can switch into this mode easily whenever you need to do testing and changes to doctests, without having to leave your existing IPython session.

%edit

Bring up an editor and execute the resulting code.

Usage:

%edit [options] [args]

%edit runs IPython’s editor hook. The default version of this hook is set to call the editor specified by your $EDITOR environment variable. If this isn’t found, it will default to vi under Linux/Unix and to notepad under Windows. See the end of this docstring for how to change the editor hook.

You can also set the value of this editor via the TerminalInteractiveShell.editor option in your configuration file. This is useful if you wish to use a different editor from your typical default with IPython (and for Windows users who typically don’t set environment variables).

This command allows you to conveniently edit multi-line code right in your IPython session.

If called without arguments, %edit opens up an empty editor with a temporary file and will execute the contents of this file when you close it (don’t forget to save it!).

Options:

-n <number>: open the editor at a specified line number. By default, the IPython editor hook uses the unix syntax ‘editor +N filename’, but you can configure this by providing your own modified hook if your favorite editor supports line-number specifications with a different syntax.

-p: this will call the editor with the same data as the previous time it was used, regardless of how long ago (in your current session) it was.

-r: use ‘raw’ input. This option only applies to input taken from the user’s history. By default, the ‘processed’ history is used, so that magics are loaded in their transformed version to valid Python. If this option is given, the raw input as typed as the command line is used instead. When you exit the editor, it will be executed by IPython’s own processor.

-x: do not execute the edited code immediately upon exit. This is mainly useful if you are editing programs which need to be called with command line arguments, which you can then do using %run.

Arguments:

If arguments are given, the following possibilities exist:

  • If the argument is a filename, IPython will load that into the editor. It will execute its contents with execfile() when you exit, loading any code in the file into your interactive namespace.

  • The arguments are ranges of input history, e.g. “7 ~1/4-6”. The syntax is the same as in the %history magic.

  • If the argument is a string variable, its contents are loaded into the editor. You can thus edit any string which contains python code (including the result of previous edits).

  • If the argument is the name of an object (other than a string), IPython will try to locate the file where it was defined and open the editor at the point where it is defined. You can use %edit function to load an editor exactly at the point where ‘function’ is defined, edit it and have the file be executed automatically.

  • If the object is a macro (see %macro for details), this opens up your specified editor with a temporary file containing the macro’s data. Upon exit, the macro is reloaded with the contents of the file.

Note: opening at an exact line is only supported under Unix, and some editors (like kedit and gedit up to Gnome 2.8) do not understand the ‘+NUMBER’ parameter necessary for this feature. Good editors like (X)Emacs, vi, jed, pico and joe all do.

After executing your code, %edit will return as output the code you typed in the editor (except when it was an existing file). This way you can reload the code in further invocations of %edit as a variable, via _<NUMBER> or Out[<NUMBER>], where <NUMBER> is the prompt number of the output.

Note that %edit is also available through the alias %ed.

This is an example of creating a simple function inside the editor and then modifying it. First, start up the editor:

In [1]: edit
Editing... done. Executing edited code...
Out[1]: 'def foo():\n    print("foo() was defined in an editing
session")\n'

We can then call the function foo():

In [2]: foo()
foo() was defined in an editing session

Now we edit foo. IPython automatically loads the editor with the (temporary) file where foo() was previously defined:

In [3]: edit foo
Editing... done. Executing edited code...

And if we call foo() again we get the modified version:

In [4]: foo()
foo() has now been changed!

Here is an example of how to edit a code snippet successive times. First we call the editor:

In [5]: edit
Editing... done. Executing edited code...
hello
Out[5]: "print('hello')\n"

Now we call it again with the previous output (stored in _):

In [6]: edit _
Editing... done. Executing edited code...
hello world
Out[6]: "print('hello world')\n"

Now we call it with the output #8 (stored in _8, also as Out[8]):

In [7]: edit _8
Editing... done. Executing edited code...
hello again
Out[7]: "print('hello again')\n"

Changing the default editor hook:

If you wish to write your own editor hook, you can put it in a configuration file which you load at startup time. The default hook is defined in the IPython.core.hooks module, and you can use that as a starting example for further modifications. That file also has general instructions on how to set a new hook for use once you’ve defined it.

%env

Get, set, or list environment variables.

Usage:

%env:

lists all environment variables/values

%env var:

get value for var

%env var val:

set value for var

%env var=val:

set value for var

%env var=$val:

set value for var, using python expansion if possible

%gui

Enable or disable IPython GUI event loop integration.

%gui [GUINAME]

This magic replaces IPython’s threaded shells that were activated using the (pylab/wthread/etc.) command line flags. GUI toolkits can now be enabled at runtime and keyboard interrupts should work without any problems. The following toolkits are supported: wxPython, PyQt4, PyGTK, Tk and Cocoa (OSX):

%gui wx      # enable wxPython event loop integration
%gui qt      # enable PyQt/PySide event loop integration
             # with the latest version available.
%gui qt6     # enable PyQt6/PySide6 event loop integration
%gui qt5     # enable PyQt5/PySide2 event loop integration
%gui gtk     # enable PyGTK event loop integration
%gui gtk3    # enable Gtk3 event loop integration
%gui gtk4    # enable Gtk4 event loop integration
%gui tk      # enable Tk event loop integration
%gui osx     # enable Cocoa event loop integration
             # (requires %matplotlib 1.1)
%gui         # disable all event loop integration

WARNING: after any of these has been called you can simply create an application object, but DO NOT start the event loop yourself, as we have already handled that.

%history
%history [-n] [-o] [-p] [-t] [-f FILENAME] [-g [PATTERN ...]] [-l [LIMIT]] [-u] [range ...]

Print input history (_i<n> variables), with most recent last.

By default, input history is printed without line numbers so it can be directly pasted into an editor. Use -n to show them.

By default, all input history from the current session is displayed. Ranges of history can be indicated using the syntax:

4

Line 4, current session

4-6

Lines 4-6, current session

243/1-5

Lines 1-5, session 243

~2/7

Line 7, session 2 before current

~8/1-~6/5

From the first line of 8 sessions ago, to the fifth line of 6 sessions ago.

Multiple ranges can be entered, separated by spaces

The same syntax is used by %macro, %save, %edit, %rerun

Examples

In [6]: %history -n 4-6
4:a = 12
5:print(a**2)
6:%history -n 4-6
positional arguments:

range

options:
-n

print line numbers for each input. This feature is only available if numbered prompts are in use.

-o

also print outputs for each input.

-p

print classic ‘>>>’ python prompts before each input. This is useful for making documentation, and in conjunction with -o, for producing doctest-ready output.

-t

print the ‘translated’ history, as IPython understands it. IPython filters your input and converts it all into valid Python source before executing it (things like magics or aliases are turned into function calls, for example). With this option, you’ll see the native history instead of the user- entered version: ‘%cd /’ will be seen as ‘get_ipython().run_line_magic(“cd”, “/”)’ instead of ‘%cd /’.

-f FILENAME

FILENAME: instead of printing the output to the screen, redirect it to the given file. The file is always overwritten, though when it can, IPython asks for confirmation first. In particular, running the command ‘history -f FILENAME’ from the IPython Notebook interface will replace FILENAME even if it already exists without confirmation.

-g <[PATTERN …]>

treat the arg as a glob pattern to search for in (full) history. This includes the saved history (almost all commands ever written). The pattern may contain ‘?’ to match one unknown character and ‘*’ to match any number of unknown characters. Use ‘%hist -g’ to show full saved history (may be very long).

-l <[LIMIT]>

get the last n lines from all sessions. Specify n as a single arg, or the default is the last 10 lines.

-u

when searching history using -g, show only unique history.

%killbgscripts

Kill all BG processes started by %%script and its family.

%load

Load code into the current frontend.

Usage:

%load [options] source

where source can be a filename, URL, input history range, macro, or element in the user namespace

If no arguments are given, loads the history of this session up to this point.

Options:

-r <lines>: Specify lines or ranges of lines to load from the source. Ranges could be specified as x-y (x..y) or in python-style x:y (x..(y-1)). Both limits x and y can be left blank (meaning the beginning and end of the file, respectively).

-s <symbols>: Specify function or classes to load from python source.

-y : Don’t ask confirmation for loading source above 200 000 characters.

-n : Include the user’s namespace when searching for source code.

This magic command can either take a local filename, a URL, an history range (see %history) or a macro as argument, it will prompt for confirmation before loading source with more than 200 000 characters, unless -y flag is passed or if the frontend does not support raw_input:

%load
%load myscript.py
%load 7-27
%load myMacro
%load http://www.example.com/myscript.py
%load -r 5-10 myscript.py
%load -r 10-20,30,40: foo.py
%load -s MyClass,wonder_function myscript.py
%load -n MyClass
%load -n my_module.wonder_function
%load_ext

Load an IPython extension by its module name.

%loadpy

Alias of %load

%loadpy has gained some flexibility and dropped the requirement of a .py extension. So it has been renamed simply into %load. You can look at %load’s docstring for more info.

%logoff

Temporarily stop logging.

You must have previously started logging.

%logon

Restart logging.

This function is for restarting logging which you’ve temporarily stopped with %logoff. For starting logging for the first time, you must use the %logstart function, which allows you to specify an optional log filename.

%logstart

Start logging anywhere in a session.

%logstart [-o|-r|-t|-q] [log_name [log_mode]]

If no name is given, it defaults to a file named ‘ipython_log.py’ in your current directory, in ‘rotate’ mode (see below).

‘%logstart name’ saves to file ‘name’ in ‘backup’ mode. It saves your history up to that point and then continues logging.

%logstart takes a second optional parameter: logging mode. This can be one of (note that the modes are given unquoted):

append

Keep logging at the end of any existing file.

backup

Rename any existing file to name~ and start name.

global

Append to a single logfile in your home directory.

over

Overwrite any existing log.

rotate

Create rotating logs: name.1~, name.2~, etc.

Options:

-o

log also IPython’s output. In this mode, all commands which generate an Out[NN] prompt are recorded to the logfile, right after their corresponding input line. The output lines are always prepended with a ‘#[Out]# ‘ marker, so that the log remains valid Python code.

Since this marker is always the same, filtering only the output from a log is very easy, using for example a simple awk call:

awk -F'#\[Out\]# ' '{if($2) {print $2}}' ipython_log.py
-r

log ‘raw’ input. Normally, IPython’s logs contain the processed input, so that user lines are logged in their final form, converted into valid Python. For example, %Exit is logged as _ip.magic(“Exit”). If the -r flag is given, all input is logged exactly as typed, with no transformations applied.

-t

put timestamps before each input line logged (these are put in comments).

-q

suppress output of logstate message when logging is invoked

%logstate

Print the status of the logging system.

%logstop

Fully stop logging and close log file.

In order to start logging again, a new %logstart call needs to be made, possibly (though not necessarily) with a new filename, mode and other options.

%lsmagic

List currently available magic functions.

%macro

Define a macro for future re-execution. It accepts ranges of history, filenames or string objects.

Usage:

%macro [options] name n1-n2 n3-n4 … n5 .. n6 …

Options:

-r: use ‘raw’ input. By default, the ‘processed’ history is used, so that magics are loaded in their transformed version to valid Python. If this option is given, the raw input as typed at the command line is used instead.

-q: quiet macro definition. By default, a tag line is printed to indicate the macro has been created, and then the contents of the macro are printed. If this option is given, then no printout is produced once the macro is created.

This will define a global variable called name which is a string made of joining the slices and lines you specify (n1,n2,… numbers above) from your input history into a single string. This variable acts like an automatic function which re-executes those lines as if you had typed them. You just type ‘name’ at the prompt and the code executes.

The syntax for indicating input ranges is described in %history.

Note: as a ‘hidden’ feature, you can also use traditional python slice notation, where N:M means numbers N through M-1.

For example, if your history contains (print using %hist -n ):

44: x=1
45: y=3
46: z=x+y
47: print(x)
48: a=5
49: print('x',x,'y',y)

you can create a macro with lines 44 through 47 (included) and line 49 called my_macro with:

In [55]: %macro my_macro 44-47 49

Now, typing my_macro (without quotes) will re-execute all this code in one pass.

You don’t need to give the line-numbers in order, and any given line number can appear multiple times. You can assemble macros with any lines from your input history in any order.

The macro is a simple object which holds its value in an attribute, but IPython’s display system checks for macros and executes them as code instead of printing them when you type their name.

You can view a macro’s contents by explicitly printing it with:

print(macro_name)
%magic

Print information about the magic function system.

Supported formats: -latex, -brief, -rest

%mamba

Run the mamba package manager within the current kernel.

Usage:

%mamba install [pkgs]

%matplotlib
%matplotlib [-l] [gui]

Set up matplotlib to work interactively.

This function lets you activate matplotlib interactive support at any point during an IPython session. It does not import anything into the interactive namespace.

If you are using the inline matplotlib backend in the IPython Notebook you can set which figure formats are enabled using the following:

In [1]: from matplotlib_inline.backend_inline import set_matplotlib_formats

In [2]: set_matplotlib_formats('pdf', 'svg')

The default for inline figures sets bbox_inches to ‘tight’. This can cause discrepancies between the displayed image and the identical image created using savefig. This behavior can be disabled using the %config magic:

In [3]: %config InlineBackend.print_figure_kwargs = {'bbox_inches':None}

In addition, see the docstrings of matplotlib_inline.backend_inline.set_matplotlib_formats and matplotlib_inline.backend_inline.set_matplotlib_close for more information on changing additional behaviors of the inline backend.

Examples

To enable the inline backend for usage with the IPython Notebook:

In [1]: %matplotlib inline

In this case, where the matplotlib default is TkAgg:

In [2]: %matplotlib
Using matplotlib backend: TkAgg

But you can explicitly request a different GUI backend:

In [3]: %matplotlib qt

You can list the available backends using the -l/–list option:

In [4]: %matplotlib --list
Available matplotlib backends: ['osx', 'qt4', 'qt5', 'gtk3', 'gtk4', 'notebook', 'wx', 'qt', 'nbagg',
'gtk', 'tk', 'inline']
positional arguments:
gui Name of the matplotlib backend to use such as ‘qt’ or ‘widget’. If given, the corresponding matplotlib

backend is used, otherwise it will be matplotlib’s default (which you can set in your matplotlib config file).

options:
-l, --list

Show available matplotlib backends

%micromamba

Run the conda package manager within the current kernel.

Usage:

%micromamba install [pkgs]

%notebook
%notebook filename

Export and convert IPython notebooks.

This function can export the current IPython history to a notebook file. For example, to export the history to “foo.ipynb” do “%notebook foo.ipynb”.

positional arguments:

filename Notebook name or filename

%page

Pretty print the object and display it through a pager.

%page [options] OBJECT

If no object is given, use _ (last output).

Options:

-r: page str(object), don’t pretty-print it.

%pastebin

Upload code to dpaste.com, returning the URL.

Usage:

%pastebin [-d “Custom description”][-e 24] 1-7

The argument can be an input history range, a filename, or the name of a string or macro.

If no arguments are given, uploads the history of this session up to this point.

Options:

-d: Pass a custom description. The default will say

“Pasted from IPython”.

-e: Pass number of days for the link to be expired.

The default will be 7 days.

%pdb

Control the automatic calling of the pdb interactive debugger.

Call as ‘%pdb on’, ‘%pdb 1’, ‘%pdb off’ or ‘%pdb 0’. If called without argument it works as a toggle.

When an exception is triggered, IPython can optionally call the interactive pdb debugger after the traceback printout. %pdb toggles this feature on and off.

The initial state of this feature is set in your configuration file (the option is InteractiveShell.pdb).

If you want to just activate the debugger AFTER an exception has fired, without having to type ‘%pdb on’ and rerunning your code, you can use the %debug magic.

%pdef

Print the call signature for any callable object.

If the object is a class, print the constructor information.

Examples

In [3]: %pdef urllib.urlopen
urllib.urlopen(url, data=None, proxies=None)
%pdoc

Print the docstring for an object.

If the given object is a class, it will print both the class and the constructor docstrings.

%pfile

Print (or run through pager) the file where an object is defined.

The file opens at the line where the object definition begins. IPython will honor the environment variable PAGER if set, and otherwise will do its best to print the file in a convenient form.

If the given argument is not an object currently defined, IPython will try to interpret it as a filename (automatically adding a .py extension if needed). You can thus use %pfile as a syntax highlighting code viewer.

%pinfo

Provide detailed information about an object.

‘%pinfo object’ is just a synonym for object? or ?object.

%pinfo2

Provide extra detailed information about an object.

‘%pinfo2 object’ is just a synonym for object?? or ??object.

%pip

Run the pip package manager within the current kernel.

Usage:

%pip install [pkgs]

%popd

Change to directory popped off the top of the stack.

%pprint

Toggle pretty printing on/off.

%precision

Set floating point precision for pretty printing.

Can set either integer precision or a format string.

If numpy has been imported and precision is an int, numpy display precision will also be set, via numpy.set_printoptions.

If no argument is given, defaults will be restored.

Examples

In [1]: from math import pi

In [2]: %precision 3
Out[2]: '%.3f'

In [3]: pi
Out[3]: 3.142

In [4]: %precision %i
Out[4]: '%i'

In [5]: pi
Out[5]: 3

In [6]: %precision %e
Out[6]: '%e'

In [7]: pi**10
Out[7]: 9.364805e+04

In [8]: %precision
Out[8]: '%r'

In [9]: pi**10
Out[9]: 93648.047476082982
%prun

Run a statement through the python code profiler.

Usage, in line mode:

%prun [options] statement

Usage, in cell mode:

%%prun [options] [statement] code… code…

In cell mode, the additional code lines are appended to the (possibly empty) statement in the first line. Cell mode allows you to easily profile multiline blocks without having to put them in a separate function.

The given statement (which doesn’t require quote marks) is run via the python profiler in a manner similar to the profile.run() function. Namespaces are internally managed to work correctly; profile.run cannot be used in IPython because it makes certain assumptions about namespaces which do not hold under IPython.

Options:

-l <limit>

you can place restrictions on what or how much of the profile gets printed. The limit value can be:

  • A string: only information for function names containing this string is printed.

  • An integer: only these many lines are printed.

  • A float (between 0 and 1): this fraction of the report is printed (for example, use a limit of 0.4 to see the topmost 40% only).

You can combine several limits with repeated use of the option. For example, -l __init__ -l 5 will print only the topmost 5 lines of information about class constructors.

-r

return the pstats.Stats object generated by the profiling. This object has all the information about the profile in it, and you can later use it for further analysis or in other functions.

-s <key>

sort profile by given key. You can provide more than one key by using the option several times: ‘-s key1 -s key2 -s key3…’. The default sorting key is ‘time’.

The following is copied verbatim from the profile documentation referenced below:

When more than one key is provided, additional keys are used as secondary criteria when the there is equality in all keys selected before them.

Abbreviations can be used for any key names, as long as the abbreviation is unambiguous. The following are the keys currently defined:

Valid Arg

Meaning

“calls”

call count

“cumulative”

cumulative time

“file”

file name

“module”

file name

“pcalls”

primitive call count

“line”

line number

“name”

function name

“nfl”

name/file/line

“stdname”

standard name

“time”

internal time

Note that all sorts on statistics are in descending order (placing most time consuming items first), where as name, file, and line number searches are in ascending order (i.e., alphabetical). The subtle distinction between “nfl” and “stdname” is that the standard name is a sort of the name as printed, which means that the embedded line numbers get compared in an odd way. For example, lines 3, 20, and 40 would (if the file names were the same) appear in the string order “20” “3” and “40”. In contrast, “nfl” does a numeric compare of the line numbers. In fact, sort_stats(“nfl”) is the same as sort_stats(“name”, “file”, “line”).

-T <filename>

save profile results as shown on screen to a text file. The profile is still shown on screen.

-D <filename>

save (via dump_stats) profile statistics to given filename. This data is in a format understood by the pstats module, and is generated by a call to the dump_stats() method of profile objects. The profile is still shown on screen.

-q

suppress output to the pager. Best used with -T and/or -D above.

If you want to run complete programs under the profiler’s control, use %run -p [prof_opts] filename.py [args to program] where prof_opts contains profiler specific options as described here.

You can read the complete documentation for the profile module with:

In [1]: import profile; profile.help()

Changed in version 7.3: User variables are no longer expanded, the magic line is always left unmodified.

%psearch

Search for object in namespaces by wildcard.

%psearch [options] PATTERN [OBJECT TYPE]

Note: ? can be used as a synonym for %psearch, at the beginning or at the end: both a*? and ?a* are equivalent to ‘%psearch a*’. Still, the rest of the command line must be unchanged (options come first), so for example the following forms are equivalent

%psearch -i a* function -i a* function? ?-i a* function

Arguments:

PATTERN

where PATTERN is a string containing * as a wildcard similar to its use in a shell. The pattern is matched in all namespaces on the search path. By default objects starting with a single _ are not matched, many IPython generated objects have a single underscore. The default is case insensitive matching. Matching is also done on the attributes of objects and not only on the objects in a module.

[OBJECT TYPE]

Is the name of a python type from the types module. The name is given in lowercase without the ending type, ex. StringType is written string. By adding a type here only objects matching the given type are matched. Using all here makes the pattern match all types (this is the default).

Options:

-a: makes the pattern match even objects whose names start with a single underscore. These names are normally omitted from the search.

-i/-c: make the pattern case insensitive/sensitive. If neither of these options are given, the default is read from your configuration file, with the option InteractiveShell.wildcards_case_sensitive. If this option is not specified in your configuration file, IPython’s internal default is to do a case sensitive search.

-e/-s NAMESPACE: exclude/search a given namespace. The pattern you specify can be searched in any of the following namespaces: ‘builtin’, ‘user’, ‘user_global’,’internal’, ‘alias’, where ‘builtin’ and ‘user’ are the search defaults. Note that you should not use quotes when specifying namespaces.

-l: List all available object types for object matching. This function can be used without arguments.

‘Builtin’ contains the python module builtin, ‘user’ contains all user data, ‘alias’ only contain the shell aliases and no python objects, ‘internal’ contains objects used by IPython. The ‘user_global’ namespace is only used by embedded IPython instances, and it contains module-level globals. You can add namespaces to the search with -s or exclude them with -e (these options can be given more than once).

Examples

%psearch a*            -> objects beginning with an a
%psearch -e builtin a* -> objects NOT in the builtin space starting in a
%psearch a* function   -> all functions beginning with an a
%psearch re.e*         -> objects beginning with an e in module re
%psearch r*.e*         -> objects that start with e in modules starting in r
%psearch r*.* string   -> all strings in modules beginning with r

Case sensitive search:

%psearch -c a*         list all object beginning with lower case a

Show objects beginning with a single _:

%psearch -a _*         list objects beginning with a single underscore

List available objects:

%psearch -l            list all available object types
%psource

Print (or run through pager) the source code for an object.

%pushd

Place the current dir on stack and change directory.

Usage:

%pushd [‘dirname’]

%pwd

Return the current working directory path.

Examples

In [9]: pwd
Out[9]: '/home/tsuser/sprint/ipython'
%pycat

Show a syntax-highlighted file through a pager.

This magic is similar to the cat utility, but it will assume the file to be Python source and will show it with syntax highlighting.

This magic command can either take a local filename, an url, an history range (see %history) or a macro as argument.

If no parameter is given, prints out history of current session up to this point.

%pycat myscript.py
%pycat 7-27
%pycat myMacro
%pycat http://www.example.com/myscript.py
%pylab
%pylab [--no-import-all] [gui]

Load numpy and matplotlib to work interactively.

This function lets you activate pylab (matplotlib, numpy and interactive support) at any point during an IPython session.

%pylab makes the following imports:

import numpy
import matplotlib
from matplotlib import pylab, mlab, pyplot
np = numpy
plt = pyplot

from IPython.display import display
from IPython.core.pylabtools import figsize, getfigs

from pylab import *
from numpy import *

If you pass --no-import-all, the last two * imports will be excluded.

See the %matplotlib magic for more details about activating matplotlib without affecting the interactive namespace.

positional arguments:
gui Name of the matplotlib backend to use such as ‘qt’ or ‘widget’. If given, the corresponding matplotlib

backend is used, otherwise it will be matplotlib’s default (which you can set in your matplotlib config file).

options:
--no-import-all

Prevent IPython from performing import * into the interactive namespace. You can govern the default behavior of this flag with the InteractiveShellApp.pylab_import_all configurable.

%quickref

Show a quick reference sheet

%recall

Repeat a command, or get command to input line for editing.

%recall and %rep are equivalent.

  • %recall (no arguments):

Place a string version of last computation result (stored in the special ‘_’ variable) to the next input prompt. Allows you to create elaborate command lines without using copy-paste:

 In[1]: l = ["hei", "vaan"]
 In[2]: "".join(l)
Out[2]: heivaan
 In[3]: %recall
 In[4]: heivaan_ <== cursor blinking

%recall 45

Place history line 45 on the next input prompt. Use %hist to find out the number.

%recall 1-4

Combine the specified lines into one cell, and place it on the next input prompt. See %history for the slice syntax.

%recall foo+bar

If foo+bar can be evaluated in the user namespace, the result is placed at the next input prompt. Otherwise, the history is searched for lines which contain that substring, and the most recent one is placed at the next input prompt.

%rehashx

Update the alias table with all executable files in $PATH.

rehashx explicitly checks that every entry in $PATH is a file with execute access (os.X_OK).

Under Windows, it checks executability as a match against a ‘|’-separated string of extensions, stored in the IPython config variable win_exec_ext. This defaults to ‘exe|com|bat’.

This function also resets the root module cache of module completer, used on slow filesystems.

%reload_ext

Reload an IPython extension by its module name.

%rerun

Re-run previous input

By default, you can specify ranges of input history to be repeated (as with %history). With no arguments, it will repeat the last line.

Options:

-l <n> : Repeat the last n lines of input, not including the current command.

-g foo : Repeat the most recent line which contains foo

%reset

Resets the namespace by removing all names defined by the user, if called without arguments, or by removing some types of objects, such as everything currently in IPython’s In[] and Out[] containers (see the parameters for details).

Parameters

-f

force reset without asking for confirmation.

-s

‘Soft’ reset: Only clears your namespace, leaving history intact. References to objects may be kept. By default (without this option), we do a ‘hard’ reset, giving you a new session and removing all references to objects from the current session.

--aggressive

Try to aggressively remove modules from sys.modules ; this may allow you to reimport Python modules that have been updated and pick up changes, but can have unintended consequences.

in

reset input history

out

reset output history

dhist

reset directory history

array

reset only variables that are NumPy arrays

See Also

reset_selective : invoked as %reset_selective

Examples

In [6]: a = 1

In [7]: a
Out[7]: 1

In [8]: 'a' in get_ipython().user_ns
Out[8]: True

In [9]: %reset -f

In [1]: 'a' in get_ipython().user_ns
Out[1]: False

In [2]: %reset -f in
Flushing input history

In [3]: %reset -f dhist in
Flushing directory history
Flushing input history

Notes

Calling this magic from clients that do not implement standard input, such as the ipython notebook interface, will reset the namespace without confirmation.

%reset_selective

Resets the namespace by removing names defined by the user.

Input/Output history are left around in case you need them.

%reset_selective [-f] regex

No action is taken if regex is not included

Options

-f : force reset without asking for confirmation.

See Also

reset : invoked as %reset

Examples

We first fully reset the namespace so your output looks identical to this example for pedagogical reasons; in practice you do not need a full reset:

In [1]: %reset -f

Now, with a clean namespace we can make a few variables and use %reset_selective to only delete names that match our regexp:

In [2]: a=1; b=2; c=3; b1m=4; b2m=5; b3m=6; b4m=7; b2s=8

In [3]: who_ls
Out[3]: ['a', 'b', 'b1m', 'b2m', 'b2s', 'b3m', 'b4m', 'c']

In [4]: %reset_selective -f b[2-3]m

In [5]: who_ls
Out[5]: ['a', 'b', 'b1m', 'b2s', 'b4m', 'c']

In [6]: %reset_selective -f d

In [7]: who_ls
Out[7]: ['a', 'b', 'b1m', 'b2s', 'b4m', 'c']

In [8]: %reset_selective -f c

In [9]: who_ls
Out[9]: ['a', 'b', 'b1m', 'b2s', 'b4m']

In [10]: %reset_selective -f b

In [11]: who_ls
Out[11]: ['a']

Notes

Calling this magic from clients that do not implement standard input, such as the ipython notebook interface, will reset the namespace without confirmation.

%run

Run the named file inside IPython as a program.

Usage:

%run [-n -i -e -G]
     [( -t [-N<N>] | -d [-b<N>] | -p [profile options] )]
     ( -m mod | filename ) [args]

The filename argument should be either a pure Python script (with extension .py), or a file with custom IPython syntax (such as magics). If the latter, the file can be either a script with .ipy extension, or a Jupyter notebook with .ipynb extension. When running a Jupyter notebook, the output from print statements and other displayed objects will appear in the terminal (even matplotlib figures will open, if a terminal-compliant backend is being used). Note that, at the system command line, the jupyter run command offers similar functionality for executing notebooks (albeit currently with some differences in supported options).

Parameters after the filename are passed as command-line arguments to the program (put in sys.argv). Then, control returns to IPython’s prompt.

This is similar to running at a system prompt python file args, but with the advantage of giving you IPython’s tracebacks, and of loading all variables into your interactive namespace for further use (unless -p is used, see below).

The file is executed in a namespace initially consisting only of __name__=='__main__' and sys.argv constructed as indicated. It thus sees its environment as if it were being run as a stand-alone program (except for sharing global objects such as previously imported modules). But after execution, the IPython interactive namespace gets updated with all variables defined in the program (except for __name__ and sys.argv). This allows for very convenient loading of code for interactive work, while giving each program a ‘clean sheet’ to run in.

Arguments are expanded using shell-like glob match. Patterns ‘*’, ‘?’, ‘[seq]’ and ‘[!seq]’ can be used. Additionally, tilde ‘~’ will be expanded into user’s home directory. Unlike real shells, quotation does not suppress expansions. Use two back slashes (e.g. \\*) to suppress expansions. To completely disable these expansions, you can use -G flag.

On Windows systems, the use of single quotes ' when specifying a file is not supported. Use double quotes ".

Options:

-n

__name__ is NOT set to ‘__main__’, but to the running file’s name without extension (as python does under import). This allows running scripts and reloading the definitions in them without calling code protected by an if __name__ == "__main__" clause.

-i

run the file in IPython’s namespace instead of an empty one. This is useful if you are experimenting with code written in a text editor which depends on variables defined interactively.

-e

ignore sys.exit() calls or SystemExit exceptions in the script being run. This is particularly useful if IPython is being used to run unittests, which always exit with a sys.exit() call. In such cases you are interested in the output of the test results, not in seeing a traceback of the unittest module.

-t

print timing information at the end of the run. IPython will give you an estimated CPU time consumption for your script, which under Unix uses the resource module to avoid the wraparound problems of time.clock(). Under Unix, an estimate of time spent on system tasks is also given (for Windows platforms this is reported as 0.0).

If -t is given, an additional -N<N> option can be given, where <N> must be an integer indicating how many times you want the script to run. The final timing report will include total and per run results.

For example (testing the script uniq_stable.py):

In [1]: run -t uniq_stable

IPython CPU timings (estimated):
  User  :    0.19597 s.
  System:        0.0 s.

In [2]: run -t -N5 uniq_stable

IPython CPU timings (estimated):
Total runs performed: 5
  Times :      Total       Per run
  User  :   0.910862 s,  0.1821724 s.
  System:        0.0 s,        0.0 s.
-d

run your program under the control of pdb, the Python debugger. This allows you to execute your program step by step, watch variables, etc. Internally, what IPython does is similar to calling:

pdb.run('execfile("YOURFILENAME")')

with a breakpoint set on line 1 of your file. You can change the line number for this automatic breakpoint to be <N> by using the -bN option (where N must be an integer). For example:

%run -d -b40 myscript

will set the first breakpoint at line 40 in myscript.py. Note that the first breakpoint must be set on a line which actually does something (not a comment or docstring) for it to stop execution.

Or you can specify a breakpoint in a different file:

%run -d -b myotherfile.py:20 myscript

When the pdb debugger starts, you will see a (Pdb) prompt. You must first enter ‘c’ (without quotes) to start execution up to the first breakpoint.

Entering ‘help’ gives information about the use of the debugger. You can easily see pdb’s full documentation with “import pdb;pdb.help()” at a prompt.

-p

run program under the control of the Python profiler module (which prints a detailed report of execution times, function calls, etc).

You can pass other options after -p which affect the behavior of the profiler itself. See the docs for %prun for details.

In this mode, the program’s variables do NOT propagate back to the IPython interactive namespace (because they remain in the namespace where the profiler executes them).

Internally this triggers a call to %prun, see its documentation for details on the options available specifically for profiling.

There is one special usage for which the text above doesn’t apply: if the filename ends with .ipy[nb], the file is run as ipython script, just as if the commands were written on IPython prompt.

-m

specify module name to load instead of script path. Similar to the -m option for the python interpreter. Use this option last if you want to combine with other %run options. Unlike the python interpreter only source modules are allowed no .pyc or .pyo files. For example:

%run -m example

will run the example module.

-G

disable shell-like glob expansion of arguments.

%save

Save a set of lines or a macro to a given filename.

Usage:

%save [options] filename [history]

Options:

-r: use ‘raw’ input. By default, the ‘processed’ history is used, so that magics are loaded in their transformed version to valid Python. If this option is given, the raw input as typed as the command line is used instead.

-f: force overwrite. If file exists, %save will prompt for overwrite unless -f is given.

-a: append to the file instead of overwriting it.

The history argument uses the same syntax as %history for input ranges, then saves the lines to the filename you specify.

If no ranges are specified, saves history of the current session up to this point.

It adds a ‘.py’ extension to the file if you don’t do so yourself, and it asks for confirmation before overwriting existing files.

If -r option is used, the default extension is .ipy.

%sc

Shell capture - run shell command and capture output (DEPRECATED use !).

DEPRECATED. Suboptimal, retained for backwards compatibility.

You should use the form ‘var = !command’ instead. Example:

“%sc -l myfiles = ls ~” should now be written as

“myfiles = !ls ~”

myfiles.s, myfiles.l and myfiles.n still apply as documented below.

%sc [options] varname=command

IPython will run the given command using commands.getoutput(), and will then update the user’s interactive namespace with a variable called varname, containing the value of the call. Your command can contain shell wildcards, pipes, etc.

The ‘=’ sign in the syntax is mandatory, and the variable name you supply must follow Python’s standard conventions for valid names.

(A special format without variable name exists for internal use)

Options:

-l: list output. Split the output on newlines into a list before assigning it to the given variable. By default the output is stored as a single string.

-v: verbose. Print the contents of the variable.

In most cases you should not need to split as a list, because the returned value is a special type of string which can automatically provide its contents either as a list (split on newlines) or as a space-separated string. These are convenient, respectively, either for sequential processing or to be passed to a shell command.

For example:

# Capture into variable a
In [1]: sc a=ls *py

# a is a string with embedded newlines
In [2]: a
Out[2]: 'setup.py\nwin32_manual_post_install.py'

# which can be seen as a list:
In [3]: a.l
Out[3]: ['setup.py', 'win32_manual_post_install.py']

# or as a whitespace-separated string:
In [4]: a.s
Out[4]: 'setup.py win32_manual_post_install.py'

# a.s is useful to pass as a single command line:
In [5]: !wc -l $a.s
  146 setup.py
  130 win32_manual_post_install.py
  276 total

# while the list form is useful to loop over:
In [6]: for f in a.l:
   ...:      !wc -l $f
   ...:
146 setup.py
130 win32_manual_post_install.py

Similarly, the lists returned by the -l option are also special, in the sense that you can equally invoke the .s attribute on them to automatically get a whitespace-separated string from their contents:

In [7]: sc -l b=ls *py

In [8]: b
Out[8]: ['setup.py', 'win32_manual_post_install.py']

In [9]: b.s
Out[9]: 'setup.py win32_manual_post_install.py'

In summary, both the lists and strings used for output capture have the following special attributes:

.l (or .list) : value as list.
.n (or .nlstr): value as newline-separated string.
.s (or .spstr): value as space-separated string.
%set_env

Set environment variables. Assumptions are that either “val” is a name in the user namespace, or val is something that evaluates to a string.

Usage:
%set_env var val:

set value for var

%set_env var=val:

set value for var

%set_env var=$val:

set value for var, using python expansion if possible

%sx

Shell execute - run shell command and capture output (!! is short-hand).

%sx command

IPython will run the given command using commands.getoutput(), and return the result formatted as a list (split on ‘n’). Since the output is _returned_, it will be stored in ipython’s regular output cache Out[N] and in the ‘_N’ automatic variables.

Notes:

1) If an input line begins with ‘!!’, then %sx is automatically invoked. That is, while:

!ls

causes ipython to simply issue system(‘ls’), typing:

!!ls

is a shorthand equivalent to:

%sx ls

2) %sx differs from %sc in that %sx automatically splits into a list, like ‘%sc -l’. The reason for this is to make it as easy as possible to process line-oriented shell output via further python commands. %sc is meant to provide much finer control, but requires more typing.

3) Just like %sc -l, this is a list with special attributes:

.l (or .list) : value as list.
.n (or .nlstr): value as newline-separated string.
.s (or .spstr): value as whitespace-separated string.

This is very useful when trying to use such lists as arguments to system commands.

%system

Shell execute - run shell command and capture output (!! is short-hand).

%sx command

IPython will run the given command using commands.getoutput(), and return the result formatted as a list (split on ‘n’). Since the output is _returned_, it will be stored in ipython’s regular output cache Out[N] and in the ‘_N’ automatic variables.

Notes:

1) If an input line begins with ‘!!’, then %sx is automatically invoked. That is, while:

!ls

causes ipython to simply issue system(‘ls’), typing:

!!ls

is a shorthand equivalent to:

%sx ls

2) %sx differs from %sc in that %sx automatically splits into a list, like ‘%sc -l’. The reason for this is to make it as easy as possible to process line-oriented shell output via further python commands. %sc is meant to provide much finer control, but requires more typing.

3) Just like %sc -l, this is a list with special attributes:

.l (or .list) : value as list.
.n (or .nlstr): value as newline-separated string.
.s (or .spstr): value as whitespace-separated string.

This is very useful when trying to use such lists as arguments to system commands.

%tb

Print the last traceback.

Optionally, specify an exception reporting mode, tuning the verbosity of the traceback. By default the currently-active exception mode is used. See %xmode for changing exception reporting modes.

Valid modes: Plain, Context, Verbose, and Minimal.

%time

Time execution of a Python statement or expression.

The CPU and wall clock times are printed, and the value of the expression (if any) is returned. Note that under Win32, system time is always reported as 0, since it can not be measured.

This function can be used both as a line and cell magic:

  • In line mode you can time a single-line statement (though multiple ones can be chained with using semicolons).

  • In cell mode, you can time the cell body (a directly following statement raises an error).

This function provides very basic timing functionality. Use the timeit magic for more control over the measurement.

Changed in version 7.3: User variables are no longer expanded, the magic line is always left unmodified.

Examples

In [1]: %time 2**128
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00
Out[1]: 340282366920938463463374607431768211456L

In [2]: n = 1000000

In [3]: %time sum(range(n))
CPU times: user 1.20 s, sys: 0.05 s, total: 1.25 s
Wall time: 1.37
Out[3]: 499999500000L

In [4]: %time print('hello world')
hello world
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00

Note

The time needed by Python to compile the given expression will be reported if it is more than 0.1s.

In the example below, the actual exponentiation is done by Python at compilation time, so while the expression can take a noticeable amount of time to compute, that time is purely due to the compilation:

In [5]: %time 3**9999;
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00 s

In [6]: %time 3**999999;
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00 s
Compiler : 0.78 s
%timeit

Time execution of a Python statement or expression

Usage, in line mode:

%timeit [-n<N> -r<R> [-t|-c] -q -p<P> -o] statement

or in cell mode:

%%timeit [-n<N> -r<R> [-t|-c] -q -p<P> -o] setup_code code code…

Time execution of a Python statement or expression using the timeit module. This function can be used both as a line and cell magic:

  • In line mode you can time a single-line statement (though multiple ones can be chained with using semicolons).

  • In cell mode, the statement in the first line is used as setup code (executed but not timed) and the body of the cell is timed. The cell body has access to any variables created in the setup code.

Options: -n<N>: execute the given statement <N> times in a loop. If <N> is not provided, <N> is determined so as to get sufficient accuracy.

-r<R>: number of repeats <R>, each consisting of <N> loops, and take the average result. Default: 7

-t: use time.time to measure the time, which is the default on Unix. This function measures wall time.

-c: use time.clock to measure the time, which is the default on Windows and measures wall time. On Unix, resource.getrusage is used instead and returns the CPU user time.

-p<P>: use a precision of <P> digits to display the timing result. Default: 3

-q: Quiet, do not print result.

-o: return a TimeitResult that can be stored in a variable to inspect

the result in more details.

Changed in version 7.3: User variables are no longer expanded, the magic line is always left unmodified.

Examples

In [1]: %timeit pass
8.26 ns ± 0.12 ns per loop (mean ± std. dev. of 7 runs, 100000000 loops each)

In [2]: u = None

In [3]: %timeit u is None
29.9 ns ± 0.643 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [4]: %timeit -r 4 u == None

In [5]: import time

In [6]: %timeit -n1 time.sleep(2)

The times reported by %timeit will be slightly higher than those reported by the timeit.py script when variables are accessed. This is due to the fact that %timeit executes the statement in the namespace of the shell, compared with timeit.py, which uses a single setup statement to import function or create variables. Generally, the bias does not matter as long as results from timeit.py are not mixed with those from %timeit.

%unalias

Remove an alias

%unload_ext

Unload an IPython extension by its module name.

Not all extensions can be unloaded, only those which define an unload_ipython_extension function.

%who

Print all interactive variables, with some minimal formatting.

If any arguments are given, only variables whose type matches one of these are printed. For example:

%who function str

will only list functions and strings, excluding all other types of variables. To find the proper type names, simply use type(var) at a command line to see how python prints type names. For example:

In [1]: type('hello')\
Out[1]: <type 'str'>

indicates that the type name for strings is ‘str’.

%who always excludes executed names loaded through your configuration file and things which are internal to IPython.

This is deliberate, as typically you may load many modules and the purpose of %who is to show you only what you’ve manually defined.

Examples

Define two variables and list them with who:

In [1]: alpha = 123

In [2]: beta = 'test'

In [3]: %who
alpha   beta

In [4]: %who int
alpha

In [5]: %who str
beta
%who_ls

Return a sorted list of all interactive variables.

If arguments are given, only variables of types matching these arguments are returned.

Examples

Define two variables and list them with who_ls:

In [1]: alpha = 123

In [2]: beta = 'test'

In [3]: %who_ls
Out[3]: ['alpha', 'beta']

In [4]: %who_ls int
Out[4]: ['alpha']

In [5]: %who_ls str
Out[5]: ['beta']
%whos

Like %who, but gives some extra information about each variable.

The same type filtering of %who can be applied here.

For all variables, the type is printed. Additionally it prints:

  • For {},[],(): their length.

  • For numpy arrays, a summary with shape, number of elements, typecode and size in memory.

  • Everything else: a string representation, snipping their middle if too long.

Examples

Define two variables and list them with whos:

In [1]: alpha = 123

In [2]: beta = 'test'

In [3]: %whos
Variable   Type        Data/Info

alpha      int         123
beta       str         test
%xdel

Delete a variable, trying to clear it from anywhere that IPython’s machinery has references to it. By default, this uses the identity of the named object in the user namespace to remove references held under other names. The object is also removed from the output history.

Options

-n : Delete the specified name from all namespaces, without checking their identity.

%xmode

Switch modes for the exception handlers.

Valid modes: Plain, Context, Verbose, and Minimal.

If called without arguments, acts as a toggle.

When in verbose mode the value --show (and --hide) will respectively show (or hide) frames with __tracebackhide__ = True value set.

Cell magics

%%bash

%%bash script magic

Run cells with bash in a subprocess.

This is a shortcut for %%script bash

%%capture
%capture [--no-stderr] [--no-stdout] [--no-display] [output]

run the cell, capturing stdout, stderr, and IPython’s rich display() calls.

positional arguments:
output The name of the variable in which to store output. This is a utils.io.CapturedIO object with stdout/err

attributes for the text of the captured output. CapturedOutput also has a show() method for displaying the output, and __call__ as well, so you can use that to quickly display the output. If unspecified, captured output is discarded.

options:
--no-stderr

Don’t capture stderr.

--no-stdout

Don’t capture stdout.

--no-display

Don’t capture IPython’s rich display.

%%html
%html [--isolated]

Render the cell as a block of HTML

options:
--isolated

Annotate the cell as ‘isolated’. Isolated cells are rendered inside their own <iframe> tag

%%javascript

Run the cell block of Javascript code

Starting with IPython 8.0 %%javascript is pending deprecation to be replaced by a more flexible system

Please See https://github.com/ipython/ipython/issues/13376

%%js

Run the cell block of Javascript code

Alias of %%javascript

Starting with IPython 8.0 %%javascript is pending deprecation to be replaced by a more flexible system

Please See https://github.com/ipython/ipython/issues/13376

%%latex

Render the cell as a block of LaTeX

The subset of LaTeX which is supported depends on the implementation in the client. In the Jupyter Notebook, this magic only renders the subset of LaTeX defined by MathJax [here](https://docs.mathjax.org/en/v2.5-latest/tex.html).

%%markdown

Render the cell as Markdown text block

%%perl

%%perl script magic

Run cells with perl in a subprocess.

This is a shortcut for %%script perl

%%pypy

%%pypy script magic

Run cells with pypy in a subprocess.

This is a shortcut for %%script pypy

%%python

%%python script magic

Run cells with python in a subprocess.

This is a shortcut for %%script python

%%python2

%%python2 script magic

Run cells with python2 in a subprocess.

This is a shortcut for %%script python2

%%python3

%%python3 script magic

Run cells with python3 in a subprocess.

This is a shortcut for %%script python3

%%ruby

%%ruby script magic

Run cells with ruby in a subprocess.

This is a shortcut for %%script ruby

%%script
%shebang [--no-raise-error] [--proc PROC] [--bg] [--err ERR] [--out OUT]

Run a cell via a shell command

The %%script line is like the #! line of script, specifying a program (bash, perl, ruby, etc.) with which to run.

The rest of the cell is run by that program.

Examples

In [1]: %%script bash
   ...: for i in 1 2 3; do
   ...:   echo $i
   ...: done
1
2
3
options:
--no-raise-error

Whether you should raise an error message in addition to a stream on stderr if you get a nonzero exit code.

--proc PROC

The variable in which to store Popen instance. This is used only when –bg option is given.

--bg

Whether to run the script in the background. If given, the only way to see the output of the command is with –out/err.

--err ERR

The variable in which to store stderr from the script. If the script is backgrounded, this will be the stderr pipe, instead of the stderr text itself and will not be autoclosed.

--out OUT

The variable in which to store stdout from the script. If the script is backgrounded, this will be the stdout pipe, instead of the stderr text itself and will not be auto closed.

%%sh

%%sh script magic

Run cells with sh in a subprocess.

This is a shortcut for %%script sh

%%svg

Render the cell as an SVG literal

%%writefile
%writefile [-a] filename

Write the contents of the cell to a file.

The file will be overwritten unless the -a (–append) flag is specified.

positional arguments:

filename file to write

options:
-a, --append

Append contents of the cell to an existing file. The file will be created if it does not exist.