>
> I think you found a bug:
>
> http://code.google.com/p/sympy/issues/detail?id=1581
>
> just use:
>
> In [3]: (1 + x).subs({N: 3})
> Out[3]: 1 + x
>
> This works for me. e.g. don't use dict(), it doesn't always work.
>
Neat. So it works when the key is a symbol but not a string.

thanks for the workaround.

Gabriel
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