IPython Sphinx extension¶
IPython provides an extension for Sphinx to highlight and run code.
Sphinx directive to support embedded IPython code.
This directive allows pasting of entire interactive IPython sessions, prompts and all, and their code will actually get re-executed at doc build time, with all prompts renumbered sequentially. It also allows you to input code as a pure python input by giving the argument python to the directive. The output looks like an interactive ipython section.
To enable this directive, simply list it in your Sphinx
(making sure the directory where you placed it is visible to sphinx, as is
needed for all Sphinx directives). For example, to enable syntax highlighting
and the IPython directive:
extensions = ['IPython.sphinxext.ipython_console_highlighting', 'IPython.sphinxext.ipython_directive']
The IPython directive outputs code-blocks with the language ‘ipython’. So if you do not have the syntax highlighting extension enabled as well, then all rendered code-blocks will be uncolored. By default this directive assumes that your prompts are unchanged IPython ones, but this can be customized. The configurable options that can be placed in conf.py are:
- The directory in which to save the figures. This is relative to the
Sphinx source directory. The default is
- The compiled regular expression to denote the start of IPython input lines. The default is re.compile(‘In [(d+)]:s?(.*)s*’). You shouldn’t need to change this.
- The compiled regular expression to denote the start of IPython output lines. The default is re.compile(‘Out[(d+)]:s?(.*)s*’). You shouldn’t need to change this.
- The string to represent the IPython input prompt in the generated ReST. The default is ‘In [%d]:’. This expects that the line numbers are used in the prompt.
- The string to represent the IPython prompt in the generated ReST. The default is ‘Out [%d]:’. This expects that the line numbers are used in the prompt.
- The string which specifies if the embedded Sphinx shell should import
Matplotlib and set the backend. The value specifies a backend that is
matplotlib.use()before any lines in
ipython_execlinesare executed. If not specified in conf.py, then the default value of ‘agg’ is used. To use the IPython directive without matplotlib as a dependency, set the value to
None. It may end up that matplotlib is still imported if the user specifies so in
ipython_execlinesor makes use of the @savefig pseudo decorator.
- A list of strings to be exec’d in the embedded Sphinx shell. Typical
usage is to make certain packages always available. Set this to an empty
list if you wish to have no imports always available. If specified in
None, then it has the effect of making no imports available. If omitted from conf.py altogether, then the default value of [‘import numpy as np’, ‘import matplotlib.pyplot as plt’] is used.
- When the @suppress pseudo-decorator is used, the execution count can be
incremented or not. The default behavior is to hold the execution count,
corresponding to a value of
True. Set this to
Falseto increment the execution count after each suppressed command.
As an example, to use the IPython directive when
matplotlib is not available,
one sets the backend to
ipython_mplbackend = None
An example usage of the directive is:
.. ipython:: In : x = 1 In : y = x**2 In : print(y)
See http://matplotlib.org/sampledoc/ipython_directive.html for additional documentation.
Note: Only one decorator is supported per input. If more than one decorator is specified, then only the last one is used.
In addition to the Pseudo-Decorators/options described at the above link, several enhancements have been made. The directive will emit a message to the console at build-time if code-execution resulted in an exception or warning. You can suppress these on a per-block basis by specifying the :okexcept: or :okwarning: options:
.. ipython:: :okexcept: :okwarning: In : 1/0 In : # raise warning.
- Turn the ad-hoc test() function into a real test suite.
- Break up ipython-specific functionality from matplotlib stuff into better separated code.