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Make TextIOWrapper's documentation clearer by copying the newline argument's description from open().

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This commit is contained in:
Antoine Pitrou 2012-08-04 00:56:19 +02:00
commit 3c25dfbf13
2 changed files with 32 additions and 17 deletions
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24
Doc/library/io.rst
View File

@ -767,14 +767,22 @@ Text I/O
sequences) can be used. Any other error handling name that has been
registered with :func:`codecs.register_error` is also valid.
*newline* can be ``None``, ``''``, ``'\n'``, ``'\r'``, or ``'\r\n'``. It
controls the handling of line endings. If it is ``None``, universal newlines
is enabled. With this enabled, on input, the lines endings ``'\n'``,
``'\r'``, or ``'\r\n'`` are translated to ``'\n'`` before being returned to
the caller. Conversely, on output, ``'\n'`` is translated to the system
default line separator, :data:`os.linesep`. If *newline* is any other of its
legal values, that newline becomes the newline when the file is read and it
is returned untranslated. On output, ``'\n'`` is converted to the *newline*.
*newline* controls how line endings are handled. It can be ``None``,
``''``, ``'\n'``, ``'\r'``, and ``'\r\n'``. It works as follows:
* On input, if *newline* is ``None``, universal newlines mode is enabled.
Lines in the input can end in ``'\n'``, ``'\r'``, or ``'\r\n'``, and these
are translated into ``'\n'`` before being returned to the caller. If it is
``''``, universal newline mode is enabled, but line endings are returned to
the caller untranslated. If it has any of the other legal values, input
lines are only terminated by the given string, and the line ending is
returned to the caller untranslated.
* On output, if *newline* is ``None``, any ``'\n'`` characters written are
translated to the system default line separator, :data:`os.linesep`. If
*newline* is ``''``, no translation takes place. If *newline* is any of
the other legal values, any ``'\n'`` characters written are translated to
the given string.
If *line_buffering* is ``True``, :meth:`flush` is implied when a call to
write contains a newline character.

25
Modules/_io/textio.c
View File

@ -635,15 +635,22 @@ PyDoc_STRVAR(textiowrapper_doc,
"errors determines the strictness of encoding and decoding (see the\n"
"codecs.register) and defaults to \"strict\".\n"
"\n"
"newline can be None, '', '\\n', '\\r', or '\\r\\n'. It controls the\n"
"handling of line endings. If it is None, universal newlines is\n"
"enabled. With this enabled, on input, the lines endings '\\n', '\\r',\n"
"or '\\r\\n' are translated to '\\n' before being returned to the\n"
"caller. Conversely, on output, '\\n' is translated to the system\n"
"default line separator, os.linesep. If newline is any other of its\n"
"legal values, that newline becomes the newline when the file is read\n"
"and it is returned untranslated. On output, '\\n' is converted to the\n"
"newline.\n"
"newline controls how line endings are handled. It can be None, '',\n"
"'\\n', '\\r', and '\\r\\n'. It works as follows:\n"
"\n"
"* On input, if newline is None, universal newlines mode is\n"
" enabled. Lines in the input can end in '\\n', '\\r', or '\\r\\n', and\n"
" these are translated into '\\n' before being returned to the\n"
" caller. If it is '', universal newline mode is enabled, but line\n"
" endings are returned to the caller untranslated. If it has any of\n"
" the other legal values, input lines are only terminated by the given\n"
" string, and the line ending is returned to the caller untranslated.\n"
"\n"
"* On output, if newline is None, any '\\n' characters written are\n"
" translated to the system default line separator, os.linesep. If\n"
" newline is '', no translation takes place. If newline is any of the\n"
" other legal values, any '\\n' characters written are translated to\n"
" the given string.\n"
"\n"
"If line_buffering is True, a call to flush is implied when a call to\n"
"write contains a newline character."