8000 gh-101754: document that on Windows, keys in `os.environ` are converted to uppercase by OTheDev · Pull Request #101840 · python/cpython · GitHub
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gh-101754: document that on Windows, keys in os.environ are converted to uppercase #101840

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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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1bed00f
fix-issue-101754
OTheDev Feb 12, 2023
19f0c6b
Address review and move note below 'On Unix'
OTheDev Mar 3, 2023
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Address review and move note below 'On Unix'
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@OTheDev
OTheDev committed Mar 3, 2023
commit 19f0c6ba1d6127c3781190da1b89bc2fadd65c25
12 changes: 5 additions & 7 deletions Doc/library/os.rst
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Expand Up @@ -201,6 +201,11 @@ process and user.
``'surrogateescape'`` error handler. Use :data:`environb` if you would like
to use a different encoding.

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'``.

.. note::

Calling :func:`putenv` directly does not change :data:`os.environ`, so it's better
Expand All @@ -212,13 +217,6 @@ 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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