check errors first before starting on work in random module

[lbaumbauer]

Bug report

Bug description:

        u = self.random()

(

cpython/Lib/random.py

Line 525 in ac8ba0c

u = self.random()

)
This line is ran even when the error case happens, which is unnecessary work. There is no disadvantage to moving the check upwards as the check is ran every time.

The check:
try: c = 0.5 if mode is None else (mode - low) / (high - low) except ZeroDivisionError: return low

CPython versions tested on:

3.13

Operating systems tested on:

No response

[picnixz]

Same as before, this is code churn.