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Commit 4e7c0cb

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gh-101754: Document that Windows converts keys in os.environ to uppercase (GH-101840)
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‎Doc/library/os.rst

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@@ -201,6 +201,11 @@ process and user.
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``'surrogateescape'`` error handler. Use :data:`environb` if you would like
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to use a different encoding.
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On Windows, the keys are converted to uppercase. This also applies when
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getting, setting, or deleting an item. For example,
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``environ['monty'] = 'python'`` maps the key ``'MONTY'`` to the value
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``'python'``.
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.. note::
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Calling :func:`putenv` directly does not change :data:`os.environ`, so it's better

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