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[3.11] gh-101754: Document that Windows converts keys in `os.environ` to uppercase (GH-101840) by miss-islington · Pull Request #102394 · python/cpython · GitHub

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[3.11] gh-101754: Document that Windows converts keys in os.environ to uppercase (GH-101840) #102394

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miss-islington merged 1 commit into from
Mar 3, 2023
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[3.11] gh-101754: Document that Windows converts keys in os.environ to uppercase (GH-101840) #102394

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5 changes: 5 additions & 0 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
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