Issue 1171: (x**2).evalf(subs={x:0}) raises TypeError: NoneType is not
iterable
http://code.google.com/p/sympy/issues/detail?id=1171
Comment #1 by ondrej.certik:
Thanks for the bugreport!
Until we fix it, just use:
In [3]: (x**2).subs({x:0.0})
Out[3]: 0
Fredrik, any idea what went wrong?
Ondrej
Issue attribute updates:
Cc: fredrik.johansson
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