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[3.8] Note regarding + mode truncation applies to both text and binary mode (GH-11314) #15869

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Sep 10, 2019
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[3.8] Note regarding + mode truncation applies to both text and binary mode (GH-11314) #15869

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6 changes: 3 additions & 3 deletions Doc/library/functions.rst
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Expand Up @@ -1068,12 +1068,12 @@ are always available. They are listed here in alphabetical order.
``'a'`` open for writing, appending to the end of the file if it exists
``'b'`` binary mode
``'t'`` text mode (default)
``'+'`` open a disk file for updating (reading and writing)
``'+'`` open for updating (reading and writing)
========= ===============================================================

The default mode is ``'r'`` (open for reading text, synonym of ``'rt'``).
For binary read-write access, the mode ``'w+b'`` opens and truncates the file
to 0 bytes. ``'r+b'`` opens the file without truncation.
Modes ``'w+'`` and ``'w+b'`` opens and truncates the file. Modes ``'r+'``
and ``'r+b'`` opens the file with no truncation.

As mentioned in the :ref:`io-overview`, Python distinguishes between binary
and text I/O. Files opened in binary mode (including ``'b'`` in the *mode*
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