John Machin <[email protected]> added the comment:
I don't understand "Changing csv api is a feature request that could only
happen in 3.3". This is NOT a request for an API change. Lennert's point is
that an API change was made in 3.0 as compared with 2.6 but there is no fixer
in 2to3. What is requested is for csv.reader/writer to give more meaningful
error messages for valid 2.x code that has been put through fixer-less 2to3.
The name of the arg is "newline". "newlines" is an attribute that stores what
was actually found in "universal newlines" mode.
newline='' is needed on input for the same reason that binary mode is required
in 2.x: \r and \n may quite validly appear in data, inside a quoted field, and
must not be treated as part of a row separator.
newline='' is needed on output for the same reason that binary mode is required
in 2.x: any \n in the data and any \n in the caller's chosen "line" terminator
must be preserved from being changed to os.linesep (e.g. \r\n).
"newline" is not available as an attribute of the _io.TextIOWrapper object
created by open('xxx.csv', 'w', newline=''); is exposing this possible?
----------
versions: +Python 3.2 -Python 3.3
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