Comment #4 on issue 3791 by asmeu...@gmail.com: AttributeError: 'Mul' object attribute 'is_commutative' is read-only, when a try to do sympy.integrate()
http://code.google.com/p/sympy/issues/detail?id=3791

Then again, maybe it isn't wrong. The line in power.py is run all the time, and it obviously works.

I think this has something to do with __slots__. Can you give the original integration that caused you to see this error?

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