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Date: Tue, 18 Jun 2013 12:14:21 +0200
From: Andreas Perstinger <andipersti@gmail.com>
To: python-list@python.org
Subject: Re: Help me with the script? How to find items in csv file A and not in file B and vice versa
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Xref: csiph.com comp.lang.python:48616

alonnirs@gmail.com wrote:
>and when I run it I get an invalid syntex error and (as a true newbie
>I used a GUI)in_a_not_b is highlighted in the with open("inAnotB.csv",
>"wb") as f: 
>    writer = csv.writer(f) 
>    writer.writerows([item] for item in_a_not_b)
                             ^^^^^^^^^^^^^^^^^^^^

The syntax for the for-clause in a comprehension is

for x in something

thus you are missing the "in" keyword:

writer.writerows([item] for item in in_a_not_b)

Bye, Andreas