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gh-95498: Document open() behavior with file descriptors #159324

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gh-95498: Document open() behavior with file descriptors #159324

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4 changes: 4 additions & 0 deletions Doc/builtins/functions.rst
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Expand Up @@ -1453,6 +1453,10 @@ are always available. They are listed here in alphabetical order.
given, it is closed when the returned I/O object is closed unless *closefd*
is set to ``False``.)

When *file* is an existing file descriptor, *open* does not change the access
mode of the file descriptor. The caller is responsible for ensuring that
the file descriptor is compatible with the requested *mode*.

*mode* is an optional string that specifies the mode in which the file is
opened. It defaults to ``'r'`` which means open for reading in text mode.
Other common values are ``'w'`` for writing (truncating the file if it
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