Comment #8 on issue 1717 by ronan.l...@gmail.com: inconsistency between
facts
http://code.google.com/p/sympy/issues/detail?id=1717
The difference does matter if there's a non-trivial .__eq__() (NB: it's not
the case
here). For instance:
In [1]: a = Symbol('a')
In [2]: %timeit a == None
10000 loops, best of 3: 30.3 us per loop
In [3]: %timeit a is None
10000000 loops, best of 3: 150 ns per loop
Back on track: I've uploaded a patch for issue 1723 that contains a fix for
this one.
It's basically the same as smichr's patch - it seems actually quite
difficult to
prevent None values to enter new_facts as I suggested in #3.
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