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bpo-30718: Add information about text buffering (GH-32351)

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(cherry picked from commit 5101d97d0b)

Co-authored-by: slateny <46876382+slateny@users.noreply.github.com>
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Miss Islington (bot) 2022-04-20 02:00:43 -07:00 • committed by GitHub
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6
Doc/library/functions.rst
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@ -1168,7 +1168,11 @@ are always available. They are listed here in alphabetical order.
*buffering* is an optional integer used to set the buffering policy. Pass 0
to switch buffering off (only allowed in binary mode), 1 to select line
buffering (only usable in text mode), and an integer > 1 to indicate the size
in bytes of a fixed-size chunk buffer. When no *buffering* argument is
in bytes of a fixed-size chunk buffer. Note that specifying a buffer size this
way applies for binary buffered I/O, but ``TextIOWrapper`` (i.e., files opened
with ``mode='r+'``) would have another buffering. To disable buffering in
``TextIOWrapper``, consider using the ``write_through`` flag for
:func:`io.TextIOWrapper.reconfigure`. When no *buffering* argument is
given, the default buffering policy works as follows:
* Binary files are buffered in fixed-size chunks; the size of the buffer is