random.py gammavariate(alpha, beta) recomputes constant multiple times

[lbaumbauer]

Bug report

Bug description:

b = (_e + alpha) / _e

while True:
   # do not compute b here
    ...

. b is a constant for a given call to gammavariate(alpha, beta)

CPython versions tested on:

3.13

Operating systems tested on:

No response

[picnixz]

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