Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3688 by smi...@gmail.com: rational=True should be used with
as_coeff_Mul to exclude oo
http://code.google.com/p/sympy/issues/detail?id=3688
Just putting this here as a TODO that can be closed once it is known that
this situation no longer exists in SymPy.
The change to oo not being rational requires that any call to as_coeff_Mul,
that is followed by treating the extracted coefficient as a Rational, be
changed to use the rational=True flag in order to watch out for infinites
that may be in the expression
c, m = e.as_coeff_Mul() # use rational=True!
...
if c.q == foo ... <--- if this follows, it will fail with oo
Some sort of proximity search or boobytrapping(*) might be able to
highlight areas where this change needs to be made.
(*) modify as_coeff_Mul to always return oo and look for the exceptions
that might occur (as opposed to test failures which, of course, will be
many).
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