Updates:
Labels: EasyToFix Milestone-Release0.7.0
Comment #5 on issue 1864 by ronan.l...@gmail.com: AttributeError:
is_commutative with Mul(Pow(2, 2, evaluate=False), 3, evaluate=False) + 1
http://code.google.com/p/sympy/issues/detail?id=1864
From issue 1907:
The exception seen comes more precisely from:
In [4]: Pow(y, 2, evaluate=False).is_commutative
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/media/sda2/Boulot/Projets/sympy-git/<ipython console> in <module>()
AttributeError: is_commutative
The problem is in Pow.__new__: is_commutative is not defined in the
evaluate=False
branch.
The fix is actually simple: make sure that is_commutative is properly
defined when
evaluate=False. This would be best accomplished by refactoring Pow.__new__
so that
there's a single exit point that actually constructs a Pow instance.
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