[New-bugs-announce] [issue1511] csv input converts \r\n to \n but csv output does not when a field has internal line breaks

[Bill Fenner]

New submission from Bill Fenner:

When a field has internal line breaks, e.g.,

foo,"bar
baz
biff",boo

that is actually 3 lines, but one csv-file row.  csv.reader() converts 
this to ['foo', 'bar\nbaz\nbiff', 'boo'].  This is a reasonable 
behavior.

Unfortunately, csv.writer() does not use the dialect's lineterminator 
setting for values with such internal linebreaks.  This means that the 
resulting file will have a mix of line-termination styles:

foo,"bar\n
baz\n
biff",boo\r\n

If the reading csv implementation is strict about its line termination, 
these line breaks will not be read properly.

----------
messages: 57902
nosy: fenner
severity: normal
status: open
title: csv input converts \r\n to \n but csv output does not when a field has internal line breaks
type: behavior
versions: Python 2.4

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1511>
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