[Tutor] line number when reading files using csv module

[Duncan Gibson]

Kent Johnson wrote:
> The line_num attribute is new in Python 2.5. This is a doc bug,
> it should be noted in the description of line_num.

Is there some way to create a wrapper around a 2.4 csv.reader to
give me pseudo line number handling? I've been experimenting with:

    import csv

    class MyReader(object):
        
        def __init__(self, inputFile):
            self.reader = csv.reader(inputFile, delimiter=' ')
            self.lineNumber = 0

        def __iter__(self):
            self.lineNumber += 1
            return self.reader.__iter__()

        def next(self):
            self.lineNumber += 1        # do I need this one?
            return self.reader.next()

    if __name__ == '__main__':
        inputFile = file('data.csv', 'rb')
        reader = MyReader(inputFile)
        for data in reader:
            print reader.lineNumber, data

But that doesn't seem to do what I want. If I add some print statements
to the methods, I can see that it calls __iter__ only once:

    __iter__
    1 ['1', '2', '3']
    1 ['2', '3', '4', '5']
    1 ['3', '4', '5', '6', '7']
    1 ['4', '5', '6', '7']
    1 ['5', '6', '7', '8', '9']

Is there some other __special__ method that I need to forward to the
csv.reader, or have I lost all control once __iter__ has done its job?

Cheers
Duncan