Comment #2 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
Also, doit will not recover the original expression for something like
x/(2*(x+y))
since the args of this are
eq
x/(2*(x + y))
eq.args
(1/2, x, 1/(x + y))
The quirky 2-term-Mul behavior applies for a number type an Add but here
you have a
number and a Mul (the 1/(x+y)) so when this is re-evaluated you don't get
x/(2*x+2*y)
One would have to do
n, d = eq.as_numer_denom()
n/d.func(*d.args)
x/(2*x + 2*y)
def doit(t):
... if t.is_Atom:
... return t
... else:
... return t.func(*t.args)
...
doit(n)/doit(d)
x/(2*x + 2*y)
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