Comment #12 on issue 2026 by [email protected]: Exact, algebraic, and
integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
Actually, if you supply the right dict-like object, it can do everything
the other replace() does. For instance, something like:
class Replace(object):
....
def __getitem__(self, expr):
match = self.pattern.matches(expr)
if match is not None:
return self.target.replace(match)
else:
raise KeyError
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