finding out the number of rows in a CSV file [Resolved]

[Jon Clements]

On Aug 27, 12:54 pm, SimonPalmer <simon.pal... at gmail.com> wrote:
> On Aug 27, 12:50 pm, SimonPalmer <simon.pal... at gmail.com> wrote:
>
>
>
> > On Aug 27, 12:41 pm, Jon Clements <jon... at googlemail.com> wrote:
>
> > > On Aug 27, 12:29 pm, "Simon Brunning" <si... at brunningonline.net>
> > > wrote:
>
> > > > 2008/8/27 SimonPalmer <simon.pal... at gmail.com>:
>
> > > > > anyone know how I would find out how many rows are in a csv file?
>
> > > > > I can't find a method which does this on csv.reader.
>
> > > > len(list(csv.reader(open('my.csv'))))
>
> > > > --
> > > > Cheers,
> > > > Simon B.
> > > > si... at brunningonline.nethttp://www.brunningonline.net/simon/blog/
>
> > > Not the best of ideas if the row size or number of rows is large!
> > > Manufacture a list, then discard to get its length -- ouch!
>
> > Thanks to everyone for their suggestions.
>
> > In my case the number of rows is never going to be that large (<200)
> > so it is a practical if slightly inelegant solution
>
> actually not resolved...
>
> after reading the file throughthe csv.reader for the length I cannot
> iterate over the rows.  How do I reset the row iterator?

If you're sure that the number of rows is always less than 200.

Slightly modify Simon Brunning's example and do:

rows = list( csv.reader(open('filename.csv')) )
row_count = len(rows)
for row in rows:
    # do something