Comment #4 on issue 2389 by [email protected]: Semantic inconsistency between Basic.__contains__ and Tuple.__contains__
http://code.google.com/p/sympy/issues/detail?id=2389
@asmeurer: OK, Basic.__contains__ should only be deprecated, but not removed.
The problem seems harder than I thought: has() calls matches() and matches() calls 'in', so replacing directly x in expr with expr.has(x) won't work. However, there's another way of doing the same thing: using x in preorder_traversal(expr).
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