Comment #1 on issue 1864 by smichr: AttributeError: is_commutative with
Mul(Pow(2, 2, evaluate=False), 3, evaluate=False) + 1
http://code.google.com/p/sympy/issues/detail?id=1864
A workaround for this is the doit method (if expr.new is changed to
expr.fun):
a=Mul(Pow(2, 2, evaluate=False), 3, evaluate=False)
a.func(*a.args)+1
13
a.new
<bound method Mul.new of 2**2*3>
a.func
<class 'sympy.core.mul.Mul'>
doit uses .new rather than .func From what I read in the docstrings, I see
that func
and new differ in that new uses assumptions to build a similar object. I
assume,
then, that func does not. So what is the better approach, 1) to use func
rather than
new or 2) to use new but give it the evaluate=True assumption. Will (2)
even work?
Changing .new to .func in doit doesn't break anything in the pre-new-polys
sympy, but
I don't know if that is the right way to go.
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