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Documentation http://docs.python.org/lib/node264.html mentions that both
'reader' and 'DictReader' support 'line_num' fields.
But in fact in version 2.5.2 of the library line_num is not in
'DictReader' class. (looking at csv.py)
For the moment I created little wrapper class to handle the issue, but
it should be done in the original 'DictReader' to support uniform
'interface' of the reader.
{{{
import csv
class DictReader(csv.DictReader):
 """ DictReader that supports line_num field. """
 def __init__(self, f, fieldnames=None, restkey=None, restval=None,
 dialect="excel", *args, **kwds):
 csv.DictReader.__init__(self, f, fieldnames, restkey, restval,
dialect)
 self.line_num = 0
 def next(self):
 res = csv.DictReader.next(self)
 self.line_num+=1
 return res
}}}
(sorry, no tests)
I suggest that line_num gets implemented, rather then documentation changed.

Fixed by adding line_num attr to DictReader in r61712, r61713 (2.5).