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From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Howw to prevent the duplication of any value in a column within a CSV file (python)
Date: Tue, 26 Apr 2016 13:51:58 -0600
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Xref: csiph.com comp.lang.python:107685

On Tue, Apr 26, 2016 at 1:05 PM, Joaquin Alzola
<Joaquin.Alzola@lebara.com> wrote:
> Just an example. Didn't use the csv but just hope that it helps.
>
> name=[]
> name_exist="Dop"
>
> with open("dop.csv") as f:
>         for line in f:
>                 line_split=line.split(',')
>                 name.append(line_strip[0])
>         if name_exist in name:
>                 print "found name " + name_exist + " Can not append"
>         else:
>                 file = open("dop.csv",'a')
>                 print "No name found"
>                 file.write(name_exist)
> file.close()

Except that as noted elsewhere in the thread a set would be a better
choice than a list, since checking membership is much faster on a set.