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gh-101754: document that on Windows, keys in os.environ are converted to uppercase #101840

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zooba merged 2 commits into from
Mar 3, 2023
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gh-101754: document that on Windows, keys in os.environ are converted to uppercase #101840

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fix-issue-101754
Feb 12, 2023
19f0c6b
Address review and move note below 'On Unix'
OTheDev Mar 3, 2023
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fix-issue-101754
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oda-gitso committed Feb 12, 2023
commit 1bed00f2371a7a76aa293e5b3bb381fd507b2590
7 changes: 7 additions & 0 deletions Doc/library/os.rst
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Expand Up @@ -212,6 +212,13 @@ process and user.
cause memory leaks. Refer to the system documentation for
:c:func:`putenv`.

.. note::

On Windows, the keys are converted to uppercase. This also applies when
getting, setting, or deleting an item. For example,
``environ['monty'] = 'python'`` maps the key ``'MONTY'`` to the value
``'python'``.

You can delete items in this mapping to unset environment variables.
:func:`unsetenv` will be called automatically when an item is deleted from
:data:`os.environ`, and when one of the :meth:`pop` or :meth:`clear` methods is
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