@staticmethod
> def update_dict(expr,D,f_update):
>
> for term in expr.args:
> base = term.args_cnc()[1]
> l_base = len(base)
>
Just a suggestion -- since you don't care about the number of bases, how
about
if base:
base = Mul._from_args(base) # much faster than recomputing with Mul
if base not in D:
D[base] = f_update(base)
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