New submission from Mike Frysinger <[email protected]>:
a common idiom i run into is wanting to add/set one or two env vars when
running a command via subprocess. the only thing the API allows currently is
inherting the current environment, or specifying the complete environment.
this means a lot of copying & pasting of the pattern:
env = os.environ.copy()
env['FOO'] = ...
env['BAR'] = ...
subprocess.run(..., env=env, ...)
it would nice if we could simply express this incremental behavior:
subprocess.run(..., extra_env={'FOO': ..., 'BAR': ...}, ...)
then the subprocess API would take care of copying & merging.
if extra_env:
assert env is None
env = os.environ.copy()
env.update(extra_env)
this is akin to subprocess.run's capture_output shortcut.
it's unclear to me whether this would be in both subprocess.Popen &
subprocess.run, or only subprocess.run. it seems like subprocess.Popen elides
convenience APIs.
----------
components: Library (Lib)
messages: 363413
nosy: vapier
priority: normal
severity: normal
status: open
title: subprocess.run: add an extra_env kwarg to complement existing env kwarg
type: enhancement
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue39857>
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