Comment #13 on issue 2128 by mattpap: cannot integrate piecewise function
numerically
http://code.google.com/p/sympy/issues/detail?id=2128
Actually, I'm not really sure what the difference between the two is.
has() is more general than __contains__(), e.g. it works with classes:
In [1]: (x*y*Wild('w')).has(Wild)
Out[1]: True
In [2]: Wild in (x*y*Wild('w'))
Out[2]: False
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