matplotlib Code

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\begin_header
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\language english
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\begin_body

\begin_layout Standard
This document contains a set of small problems, drawn from many different
 fields, meant to illustrate commonly useful techniques for using Python
 in scientific computing.
\end_layout

\begin_layout Standard
All problems are presented in a similar fashion: the task is explained including
 any necessary mathematical background and a `code skeleton' is provided
 that is meant to serve as a starting point for the solution of the exercise.
 In some cases, some example output of the expected solution, figures or
 additional hints may be provided as well.
 
\end_layout

\begin_layout Standard
The accompanying source download for this workbook contains the complete
 solutions, which are not part of this document for the sake of brevity.
\end_layout

\begin_layout Standard
For several examples, the provided skeleton contains pre-written tests which
 validate the correctness of the expected answers.
 When you have completed the exercise successfully, you should be able to
 run it from within IPython and see something like this (illustrated using
 a trapezoidal rule problem, whose solution is in the file 
\family typewriter
trapezoid.py
\family default
):
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status open

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\backslash
begin{lstlisting}
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\begin_layout Standard

In [7]: run trapezoid.py
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....
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----------------------------------------------------------------------
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\begin_layout Standard

Ran 4 tests in 0.003s
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\end_layout

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OK
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\backslash
end{lstlisting}
\end_layout

\end_inset


\end_layout

\begin_layout Standard
This message tells you that 4 automatic tests were successfully executed.
 The idea of including automatic tests in your code is a common one in modern
 software development, and Python includes in its standard library two modules
 for automatic testing, with slightly different functionality: 
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unittest
\family default
 and 
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doctest
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.
 These tests were written using the 
\family typewriter
unittest
\family default
 system, whose complete documentation can be found here: 
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.
 
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\begin_layout Standard
Other exercises will illustrate the use of the 
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doctest
\family default
 system, since it provides complementary functionality.
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\end_body
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