Comment #42 on issue 1757 by ronan.l...@gmail.com: coding style http://code.google.com/p/sympy/issues/detail?id=1757
I disagree with 1) because in many cases it's more natural to not use self.
I really don't think there are "many cases". I agree it's debatable for some special methods like '__add__' but using something like "def __add__(a, b):" masks the syntactic dissymetry between the arguments in a case where it's particularly important to be aware of it due to the mismatch with the semantic symmetry between the arguments.
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