Comment #5 on issue 2467 by [email protected]: Better way to test if evalf() returns a Number
http://code.google.com/p/sympy/issues/detail?id=2467
testing is easier than I mentioned above: `x.is_Number or pure_complex(x)`:
from sympy.core.evalf import pure_complex pure_complex(a) pure_complex(b)
(3, 1)
a
3
b
3 + I
a.is_Number, b.is_Number
(True, False)
pure_complex(a), pure_complex(b)
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