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Tests in example form - IPython

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You can write text files with examples that use IPython prompts (as long as you

use the nose ipython doctest plugin), but you can not mix and match prompt

styles in a single file. That is, you either use all ``>>>`` prompts or all

IPython-style prompts. Your test suite *can* have both types, you just need to

put each type of example in a separate. Using IPython prompts, you can paste

directly from your session::

In [5]: s="Hello World"

In [6]: s.upper()

Out[6]: 'HELLO WORLD'

Another example::

In [8]: 1+3

Out[8]: 4

Just like in IPython docstrings, you can use all IPython syntax and features::

In [9]: !echo "hello"

hello

In [10]: a='hi'

In [11]: !echo $a

hi