.. _sec_code:

Code Cells
==========


Maximum Line Length
-------------------

We recommend you to set the maximum line length to be 78 to avoid
automatic line break in PDF. You can enable the Ruler extension in
`nbextensions <https://github.com/ipython-contrib/jupyter_contrib_nbextensions>`__
to add visual vertical line in Jupyter when writing codes.

.. raw:: latex

   \diilbookstyleinputcell

.. code:: python

    '-' * 78




.. raw:: latex

   \diilbookstyleoutputcell

.. parsed-literal::
    :class: output

    '------------------------------------------------------------------------------'



Hide Source and Outputs
-----------------------

We can hide the source of a code cell by adding a comment line
``# Hide code`` in the cell. We can also hide the code cell outputs
using ``# Hide outputs``

For example, here is the normal code cell:

.. raw:: latex

   \diilbookstyleinputcell

.. code:: python

    1+2+3




.. raw:: latex

   \diilbookstyleoutputcell

.. parsed-literal::
    :class: output

    6



Let's hide the source codes





.. raw:: latex

   \diilbookstyleoutputcell

.. parsed-literal::
    :class: output

    6



Also try hiding the outputs

.. raw:: latex

   \diilbookstyleinputcell

.. code:: python

    # Hide outputs
    1+2+3

Plotting
--------

We recommend you to use the ``svg`` format to plot a figure. For
example, the following code configures ``matplotlib``

.. raw:: latex

   \diilbookstyleinputcell

.. code:: python

    %matplotlib inline
    import numpy as np
    from IPython import display
    from matplotlib import pyplot as plt
    
    display.set_matplotlib_formats('svg')
    
    x = np.arange(0, 10, 0.1)
    plt.plot(x, np.sin(x));



.. figure:: output_code_e38883_9_0.svg