Comment #5 on issue 1350 by asmeu...@gmail.com: Is WildFunction broken? http://code.google.com/p/sympy/issues/detail?id=1350
All SymPy tests are included with the source code of sympy (see the tests subdirectories). They can often serve as nice examples of what the code can do, but their purpose is to make sure the code works, not to instruct users. So sometimes they can be less readable than might be desired, for example, because some kind of equality testing is factored out into a little helper function.
We always aim to document our API completely in docstrings, and to give sufficient doctests to show how things work. Unlike regular tests, doctests are designed to be read and understood by people, and are only tested to make sure that they are correct.
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