New submission from Antony Lee <[email protected]>:
Currently, the documentation for Popen.returncode states
The child return code, set by poll() and wait() (and indirectly by
communicate()). A None value indicates that the process hasn’t terminated yet.
A negative value -N indicates that the child was terminated by signal N
(POSIX only).
As far back as https://bugs.python.org/issue1727024 it had been suggested that
this fails to emphasize an important piece of information, namely that this
attribute can be outdated (it is *only* set if poll() or wait() are called;
this is not obvious, e.g. returncode could have beeen implemented as a property
that auto-calls poll()). I do realize that a strict reading of the docs does
suggest the actual behavior, but a bit of explicitness won't hurt...
The wording suggested in https://bugs.python.org/issue1727024 seems clearer to
me ("Note: The value stored in returncode may be out-of-date. Use poll() to
reliably find the current return code.").
----------
assignee: docs@python
components: Documentation
messages: 387463
nosy: Antony.Lee, docs@python
priority: normal
severity: normal
status: open
title: Clarify that Popen.returncode does not get auto-set when the process
terminates
versions: Python 3.10
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<https://bugs.python.org/issue43286>
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