Comment #8 on issue 2389 by asmeurer: Semantic inconsistency between
Basic.__contains__ and Tuple.__contains__
http://code.google.com/p/sympy/issues/detail?id=2389
I talked to Mateusz about this at SciPy, and he thinks, and I agree, that a
in b should be equivalent to a in b.args. in other words,
Basic.__contains__ should look something like
def __contains__(self, other):
return other in self.args
And has() should handle all the "smarter" mathematical containing (like x*y
in x*y*z), using __contains__ at the base level. This is also very highly
tied in with the restructuring of replace, subs, and match.
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