On Fri, Apr 24, 2015 at 6:01 PM, Joachim Durchholz <[email protected]> wrote:
> Am 24.04.2015 um 00:02 schrieb Jason Moore:
>>
>> That makes sense, but I'm not sure whether "Garbage in - Garbage Out"
>> should apply or whether SymPy should throw and error.
>
>
> If something is invalid, the user needs to be notified.
> General policy.
> Otherwise, if the expressions become large, the user will have difficulties
> finding out where the garbage went in.
+1, perhaps raise a ValueError('Attempt to substitute an invalid value
for symbol: %s' % s)
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