New submission from STINNER Victor <[email protected]>:
On a file, "with file:" fails if it's used a second time:
---
fp = open('/etc/issue')
with fp:
print("first")
with fp:
print("second")
---
fails with "ValueError: I/O operation on closed file", because file.__enter__()
raises this exception if the file is closed.
I propose to have the same behavior on multiprocessing.Pool.__enter__() to
detect when the multiprocessing API is misused.
Anyway, after the first "with pool:" block, the pool becomes unusable to
schedule now tasks: apply() raise ValueError("Pool not running") in that case
for example.
----------
components: Library (Lib)
messages: 331719
nosy: vstinner
priority: normal
severity: normal
status: open
title: multiprocessing.Pool.__enter__() should raise an exception if called
twice
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue35477>
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