Comment #7 on issue 3006 by [email protected]: sign(Symbol('z',
zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
I think so, because
1) Using .is_zero would for example also handle Float('0') (once
Float('0').is_zero is fixed, see https://github.com/sympy/sympy/pull/1743):
In [3]: sign(Float('0'))
Out[3]: -1
2) Symbols can still be created that have is_zero=True:
In [4]: z = Symbol("z", nonnegative=True, nonpositive=True)
In [5]: z.is_zero
Out[5]: True
In [6]: sign(z)
Out[6]: sign(z)
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