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gh-85133: Add that getenv uses os.environ #91874

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May 2, 2022
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gh-85133: Add that getenv uses os.environ #91874

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Add that getenv uses os.environ
slateny Apr 24, 2022
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Apply suggestions from code review
slateny May 2, 2022
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Duplicate wording for environb
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slateny May 2, 2022
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8 changes: 6 additions & 2 deletions Doc/library/os.rst
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Expand Up @@ -292,7 +292,10 @@ process and user.
.. function:: getenv(key, default=None)

Return the value of the environment variable *key* if it exists, or
*default* if it doesn't. *key*, *default* and the result are str.
*default* if it doesn't. *key*, *default* and the result are str. Note that
since :func:`getenv` uses ``os.environ``, the mapping of :func:`getenv` is
similarly also captured on import, and the function may not reflect
future environment changes.

On Unix, keys and values are decoded with :func:`sys.getfilesystemencoding`
and ``'surrogateescape'`` error handler. Use :func:`os.getenvb` if you
Expand Down Expand Up @@ -514,7 +517,8 @@ process and user.
Assignments to items in ``os.environ`` are automatically translated into
corresponding calls to :func:`putenv`; however, calls to :func:`putenv`
don't update ``os.environ``, so it is actually preferable to assign to items
of ``os.environ``.
of ``os.environ``. This also applies to :func:`getenv`, which uses
``os.environ`` in its implementation.

.. note::

Expand Down