Comment #9 on issue 2389 by [email protected]: 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."
Some inconsistency would remain.
In [47]: x=Symbol('x',negative=True)
In [48]: y=Symbol('y',positive=True)
In [49]: y in Interval(x, y, True, True)
Out[49]: False
In [50]: y in Interval(x, y, True, True).args
Out[50]: True
I would simply drop .__contains__() method in Basic.
If one want "x in expr.args", this is not so painful to write, and it is
explicit.
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