[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Chris Jerdonek]

Changes by Chris Jerdonek :


--
components: +Library (Lib) -None
title: cvs.reader does not support escaped newline when quoting=cvs.QUOTE_NONE 
-> csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Maciej Szulik]

Maciej Szulik added the comment:

I've confirmed that bug in the latest repo version, still exists. I attach 
patch for py3k. 
I'll try to have a look at it in the current version, as soon as it will be 
fixed I'll port it to 2.7.

--
nosy: +maciej.szulik
versions: +Python 3.4
Added file: http://bugs.python.org/file27509/test_csv_py3k.py

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Łukasz Langa]

Changes by Łukasz Langa :


--
assignee:  -> lukasz.langa
nosy: +lukasz.langa
versions: +Python 3.2, Python 3.3

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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nosy: +serhiy.storchaka

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

CSV is not well defined format. What you expect to read from csv.reader(['one', 
'two'])? If two rows ['one'] and ['two'], than the reader in its own right and 
there is no bug which can be fixed.

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Kalon Mills]

Kalon Mills added the comment:

Serhiy,  sorry I'm not sure I understand your question.  But if you take a look 
at the script that exhibits the problem I think the bug that I'm reporting 
becomes more clear.

Namely, using the dialect configuration shown in the script, the round trip 
conversion from string through writer then through the reader back to string is 
inconsistent.  The reader should return as output the same input that was given 
to the corresponding writer and this is not the case.  

So even if CVS in not well defined I believe the writer and reader should at 
least be consistent.

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Michael Johnson]

Michael Johnson added the comment:

On input, the reader sees a line like 

['one\\\n','element']

from the file iterator and successfully escapes the newline character, but 
still interprets the end of the string as the end of a record.  I've attached a 
patch that modifies this behavior, so that encountering the end of a string 
immediately after an escaped \r or \n is does not begin a new record.

--
keywords: +patch
nosy: +mjohnson
Added file: http://bugs.python.org/file29495/csv.patch

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[Roundup Robot]

Roundup Robot added the comment:

New changeset 940748853712 by R David Murray in branch 'default':
#15927: Fix cvs.reader parsing of escaped \r\n with quoting off.
http://hg.python.org/cpython/rev/940748853712

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nosy: +python-dev

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[issue15927] csv.reader() does not support escaped newline when quoting=csv.QUOTE_NONE

[R. David Murray]

R. David Murray added the comment:

Although this is clearly a bug fix, it also represents a behavior change that 
could cause a working program to fail.  I have therefore only applied it to 
3.4, but I'm open to arguments that it should be backported.

Thanks for the patch, Michael.

--
assignee: lukasz.langa -> 
nosy: +r.david.murray
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed
versions:  -Python 2.7, Python 3.2, Python 3.3

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