Comment #14 on issue 2307 by smi...@gmail.com: Duplicate methods:
as_coeff_mul and as_coeff_Mul
http://code.google.com/p/sympy/issues/detail?id=2307
The test was just testing the ability to efficiently get the coefficient.
If you have to do something with the rest of the expression, then using
Mul(*b) will be slower than using _new_rawargs.
I thought I already looked at usage of the two before but I'll look again.
My three proposals are:
1) drop as_coeff_Mul (current pull request)
2) drop all as_coeff_foo and make foo.make_args include an explicit number
in slot0
3) drop as_coeff_add and mull and replace as_coeff_add with as_coeff_Add -
breaking apart the terms yourself is easy, putting them together
efficiently is a bit of a hastle.
If only the coefficient is ever really needed, add .mul0 and .add0 methods
to return only the leading Number of the expression when treated like a Mul
or Add.
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