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Diffstat (limited to 'Doc/library/io.rst')
| -rw-r--r-- | Doc/library/io.rst | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/Doc/library/io.rst b/Doc/library/io.rst index f632752..3a8ddd0 100644 --- a/Doc/library/io.rst +++ b/Doc/library/io.rst @@ -768,16 +768,20 @@ Text I/O sequences) can be used. Any other error handling name that has been registered with :func:`codecs.register_error` is also valid. + .. index:: + single: universal newlines; io.TextIOWrapper class + *newline* controls how line endings are handled. It can be ``None``, ``''``, ``'\n'``, ``'\r'``, and ``'\r\n'``. It works as follows: - * When reading input from the stream, 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. + * When reading input from the stream, if *newline* is ``None``, + :term:`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 newlines + 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. * When writing output to the stream, if *newline* is ``None``, any ``'\n'`` characters written are translated to the system default line separator, @@ -843,10 +847,13 @@ Text I/O output.close() +.. index:: + single: universal newlines; io.IncrementalNewlineDecoder class + .. class:: IncrementalNewlineDecoder - A helper codec that decodes newlines for universal newlines mode. It - inherits :class:`codecs.IncrementalDecoder`. + A helper codec that decodes newlines for :term:`universal newlines` mode. + It inherits :class:`codecs.IncrementalDecoder`. Performance |