Comment #2 on issue 3602 by [email protected]: AssertionError while factoring noncommutative symbols.
http://code.google.com/p/sympy/issues/detail?id=3602
That's shorthand for "not implemented". But you can get factoring with the following:
from sympy import * x, y = symbols('x y', commutative=False) k = Symbol('k', integer=True) factor(expand((x*y)**k + (x*y)**(k + 1)))
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