Comment #31 on issue 1620 by [email protected]: Allow derivatives of
unknown functions evaluated at a point
http://code.google.com/p/sympy/issues/detail?id=1620
Yes,I was just looking into this. It turns out that hash does not need to
be unique, one could simply use
def __hash__(self):
return 1
safely, but it's very inneficient (it requires __eq__ to be called every
time). Having objects that compare equal returning different hashes is "a
bad thing". See
http://docs.python.org/reference/datamodel.html#object.__hash__
I updated the pull request with a __hash__ based on the free_variables. I
think we should also fix Lambda.
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