Comment #3 on issue 2389 by Vinzent.Steinberg: Semantic inconsistency between Basic.__contains__ and Tuple.__contains__
http://code.google.com/p/sympy/issues/detail?id=2389
I agree that this inconsistency can lead to problems (Basic.__contains__ vs. Tuple. __contains__, where the latter is an instance of Basic.) and that Basic.__contains__ is redundant to Basic.has.
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