Comment #30 on issue 1261 by asmeurer: incorrect exponentiation with
non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=1261
Indeed, 10x faster:
In [1]: a = S(1)
In [2]: %timeit a == S.One
1000000 loops, best of 3: 4.21 us per loop
In [3]: %timeit a is S.One
1000000 loops, best of 3: 402 ns per loop
So I guess is should be used over == whenever there is guaranteed to be
only one object of that type. Are all
the named classes in S like this? Maybe this should be a new issue to fix
this everywhere in SymPy.
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