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Dev: IPython Sphinx directive
.. _ipython_directive:
The ipython directive is a stateful ipython shell for embedding in
sphinx documents. It knows about standard ipython prompts, and
extracts the input and output lines. These prompts will be renumbered
starting at 1. The inputs will be fed to an embedded ipython
interpreter and the outputs from that interpreter will be inserted as
well. For example, code blocks like the following::
.. ipython::
In [136]: x = 2
In [137]: x**3
Out[137]: 8
will be rendered as
.. ipython::
In [136]: x = 2
In [137]: x**3 Out[137]: 8
.. note::
This tutorial should be read side-by-side with the Sphinx source for this document because otherwise you will see only the rendered output and not the code that generated it. Excepting the example above, we will not in general be showing the literal ReST in this document that generates the rendered output.
The state from previous sessions is stored, and standard error is trapped. At doc build time, ipython's output and std err will be inserted, and prompts will be renumbered. So the prompt below should be renumbered in the rendered docs, and pick up where the block above left off.
.. ipython::
In [138]: z = x*3 # x is recalled from previous block
In [139]: z Out[139]: 6
In [140]: print z --------> print(z) 6
File "<ipython console>", line 1
q = z[) # this is a syntax error -- we trap ipy exceptions
^
SyntaxError: invalid syntax
The embedded interpreter supports some limited markup. For example, you can put comments in your ipython sessions, which are reported verbatim. There are some handy "pseudo-decorators" that let you doctest the output. The inputs are fed to an embedded ipython session and the outputs from the ipython session are inserted into your doc. If the output in your doc and in the ipython session don't match on a doctest assertion, an error will be
.. ipython::
In [1]: x = 'hello world'
@doctest In [2]: x.upper() Out[2]: 'HELLO WORLD'
@verbatim In [3]: x.st x.startswith x.strip
Multi-line input is supported.
.. ipython::
In [130]: url = 'http://ichart.finance.yahoo.com/table.csv?s=CROX\ .....: &d=9&e=22&f=2009&g=d&a=1&br=8&c=2006&ignore=.csv'
In [131]: print url.split('&') --------> print(url.split('&')) ['http://ichart.finance.yahoo.com/table.csv?s=CROX', 'd=9', 'e=22',
You can do doctesting on multi-line output as well. Just be careful when using non-deterministic inputs like random numbers in the ipython directive, because your inputs are ruin through a live interpreter, so if you are doctesting random output you will get an error. Here we "seed" the random number generator for deterministic output, and we suppress the seed line so it doesn't show up in the rendered output
.. ipython::
In [133]: import numpy.random
@suppress In [134]: numpy.random.seed(2358)
@doctest In [135]: numpy.random.rand(10,2) Out[135]: array([[ 0.64524308, 0.59943846], [ 0.47102322, 0.8715456 ], [ 0.29370834, 0.74776844], [ 0.99539577, 0.1313423 ], [ 0.16250302, 0.21103583], [ 0.81626524, 0.1312433 ], [ 0.67338089, 0.72302393], [ 0.7566368 , 0.07033696], [ 0.22591016, 0.77731835], [ 0.0072729 , 0.34273127]])
Another demonstration of multi-line input and output
.. ipython::
In [106]: print x --------> print(x) jdh
In [109]: for i in range(10): .....: print i .....: .....: 0 1 2 3 4 5 6 7 8 9
Most of the "pseudo-decorators" can be used an options to ipython
mode. For example, to setup matplotlib pylab but suppress the output,
you can do. When using the matplotlib use directive, it should
occur before any import of pylab. This will not show up in the
rendered docs, but the commands will be executed in the embedded
interpreter and subsequent line numbers will be incremented to reflect
the inputs::
.. ipython:: :suppress:
In [144]: from pylab import *
In [145]: ion()
.. ipython:: :suppress:
In [144]: from pylab import *
In [145]: ion()
Likewise, you can set :doctest: or :verbatim: to apply these
settings to the entire block. For example,
.. ipython:: :verbatim:
In [9]: cd mpl/examples/ /home/jdhunter/mpl/examples
In [10]: pwd Out[10]: '/home/jdhunter/mpl/examples'
In [14]: cd mpl/examples/ mpl/examples/animation/ mpl/examples/misc/ mpl/examples/api/ mpl/examples/mplot3d/ mpl/examples/axes_grid/ mpl/examples/pylab_examples/ mpl/examples/event_handling/ mpl/examples/widgets
In [14]: cd mpl/examples/widgets/ /home/msierig/mpl/examples/widgets
In [15]: !wc * 2 12 77 README.txt 40 97 884 buttons.py 26 90 712 check_buttons.py 19 52 416 cursor.py 180 404 4882 menu.py 16 45 337 multicursor.py 36 106 916 radio_buttons.py 48 226 2082 rectangle_selector.py 43 118 1063 slider_demo.py 40 124 1088 span_selector.py 450 1274 12457 total
You can create one or more pyplot plots and insert them with the
@savefig decorator.
.. ipython::
@savefig plot_simple.png width=4in In [151]: plot([1,2,3]);
@savefig hist_simple.png width=4in In [151]: hist(np.random.randn(10000), 100);
In a subsequent session, we can update the current figure with some text, and then resave
.. ipython::
In [151]: ylabel('number')
In [152]: title('normal distribution')
@savefig hist_with_text.png width=4in In [153]: grid(True)
You can also have function definitions included in the source.
.. ipython::
In [3]: def square(x):
...: """
...: An overcomplicated square function as an example.
...: """
...: if x < 0:
...: x = abs(x)
...: y = x * x
...: return y
...:
Then call it from a subsequent section.
.. ipython::
In [4]: square(3) Out [4]: 9
In [5]: square(-2) Out [5]: 4
Pure python code is supported by the optional argument python. In this pure
python syntax you do not include the output from the python interpreter. The
following markup::
.. ipython:: python
foo = 'bar'
print foo
foo = 2
foo**2
Renders as
.. ipython:: python
foo = 'bar' print foo foo = 2 foo**2
We can even plot from python, using the savefig decorator, as well as, suppress output with a semicolon
.. ipython:: python
@savefig plot_simple_python.png width=4in plot([1,2,3]);
Similarly, std err is inserted
.. ipython:: python
foo = 'bar' foo[)
Comments are handled and state is preserved
.. ipython:: python
print foo
If you don't see the next code block then the options work.
.. ipython:: python :suppress:
ioff() ion()
Multi-line input is handled.
.. ipython:: python
line = 'Multi
line &
support &
works'
print line.split('&')
Functions definitions are correctly parsed
.. ipython:: python
def square(x): """ An overcomplicated square function as an example. """ if x < 0: x = abs(x) y = x * x return y
And persist across sessions
.. ipython:: python
print square(3) print square(-2)
Pretty much anything you can do with the ipython code, you can do with with a simple python script. Obviously, though it doesn't make sense to use the doctest option.
Here are the supported decorators, and any optional arguments they
take. Some of the decorators can be used as options to the entire
block (eg verbatim and suppress), and some only apply to the
line just below them (eg savefig).
@suppress
execute the ipython input block, but suppress the input and output
block from the rendered output. Also, can be applied to the entire
``..ipython`` block as a directive option with ``:suppress:``.
@verbatim
insert the input and output block in verbatim, but auto-increment
the line numbers. Internally, the interpreter will be fed an empty
string, so it is a no-op that keeps line numbering consistent.
Also, can be applied to the entire ``..ipython`` block as a
directive option with ``:verbatim:``.
@savefig OUTFILE [IMAGE_OPTIONS]
save the figure to the static directory and insert it into the
document, possibly binding it into a minipage and/or putting
code/figure label/references to associate the code and the
figure. Takes args to pass to the image directive (*scale*,
*width*, etc can be kwargs); see `image options
<http://docutils.sourceforge.net/docs/ref/rst/directives.html#image>`_
for details.
@doctest
Compare the pasted in output in the ipython block with the output
generated at doc build time, and raise errors if they don’t
match. Also, can be applied to the entire ``..ipython`` block as a
directive option with ``:doctest:``.
ipython_savefig_dir
The directory in which to save the figures. This is relative to the
Sphinx source directory. The default is `html_static_path`.
ipython_rgxin
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.
ipython_rgxout
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.
ipython_promptin
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.
ipython_promptout
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.