Comment #5 on issue 2114 by jensen.oyvind: Mul.make_args(S.One) returns () http://code.google.com/p/sympy/issues/detail?id=2114
I agree with smichr on this. Although the current behavior is technically correct, it appears inconsistent when you get Mul.make_args(2) == (2,), but Mul.make_args(1) == tuple(). I think that the current behavior can quickly become a source of bugs. (I had one recently in the secondquant pull request, as I didn't expect a Mul without arguments.)
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