[issue42648] subprocess: add a helper/parameter to catch exec() OSError exception

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

arguably run() with check=True could've turned the OSError into a CalledProcessError [can't do that now, someone surely depends on it].  So if both are supplied, perhaps it does that instead of returning a CompletedProcess with .oserror set?

the API surface we've accumulated in subprocess over the decades is huge. :(

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<https://bugs.python.org/issue42648>
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