I'm not sure why that doesn't work but you can just use evalf directly:
In [7]: expr
Out[7]:
5/2 5/2
10⋅x ⋅ℯ
────────────
3
In [8]: expr.n()
Out[8]:
2.5
40.6083132023449⋅x
Oscar
On Thu, 6 Aug 2020 at 23:00, [email protected]
<[email protected]> wrote:
>
> Hello,
>
> consider this trivial example:
>
> x = symbols("x")
> expr = S(10) / 3 * exp(S(5) / 2) * x**(S(5) / 2)
>
> I would like to convert all rational numbers to float. I though it would be
> easy, for example:
>
> expr.replace(lambda e: e.is_Rational, lambda e: e.evalf())
>
> However, Rational numbers in the exponents are not converted. Why?
>
> Thanks in advance!
>
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