[issue35477] multiprocessing.Pool.__enter__() should raise an exception if called twice

[STINNER Victor]

STINNER Victor <vstin...@redhat.com> added the comment:

Currently, the error only occurs when apply() is called:
---
import multiprocessing

def the_test():
    pool = multiprocessing.Pool(1)
    with pool:
        print(pool.apply(int, (2,)))
    with pool:
        print(pool.apply(int, (3,))) # <-- raise here

the_test()
---

I would prefer to get an error on at the second "with pool:" line.

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<https://bugs.python.org/issue35477>
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