[New-bugs-announce] [issue2078] CSV Sniffer does not function properly on single column .csv files

Jean-Philippe Laverdure report at bugs.python.org
Tue Feb 12 17:02:12 CET 2008

New submission from Jean-Philippe Laverdure:

When attempting to sniff() the dialect for the attached .csv file,
csv.Sniffer.sniff() returns an unusable dialect:

>>> import csv
>>> file = open('listB2Mforblast.csv', 'r')
>>> dialect = csv.Sniffer().sniff(file.readline())
>>> file.seek(0)
>>> file.readline()
>>> file.seek(0)
>>> reader = csv.DictReader(file, dialect)
>>> reader.next()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/soft/bioinfo/linux/python-2.5/lib/python2.5/csv.py", line 93,
in next
    d = dict(zip(self.fieldnames, row))
TypeError: zip argument #1 must support iteration

However, this works fine:
>>> file.seek(0)
>>> reader = csv.DictReader(file)
>>> reader.next()
{'Sequence': 'AALENTHLL'}

If I use a 2 column file, sniff() works perfectly.
It only seems to have a problem with single column .csv files (which are
still .csv files in my opinion)

Thanks for looking into this.

components: Extension Modules
files: listB2Mforblast.csv
messages: 62319
nosy: jplaverdure
severity: normal
status: open
title: CSV Sniffer does not function properly on single column .csv files
type: behavior
versions: Python 2.5
Added file: http://bugs.python.org/file9416/listB2Mforblast.csv

Tracker <report at bugs.python.org>

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