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Date: Tue, 12 Nov 2013 09:38:53 +1100
Subject: Re: Creating a function for a directory
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:59108

On Tue, Nov 12, 2013 at 9:26 AM, Matt <mattgraves7@gmail.com> wrote:
> So I want to take the file, "desktop/test.txt" and write it to "desktop/newfolder/test.txt". I tried the below script, and it gave me: "IOError: [Errno 2] No such file or directory: 'desktop/%s.txt'". Any suggestions would be great.
>
>
>
> def firstdev(file):
>         in_file = open("desktop/%s.txt") % file
>         indata = in_file.read()
>         out_file = open("desktop/newfolder/%s.txt", 'w') % file

You're using the % operator, which does your interpolations, at the
wrong point. You want to be adjusting the file name, not adjusting the
opened file:

        in_file = open("desktop/%s.txt" % file)
        out_file = open("desktop/newfolder/%s.txt" % file, 'w')

ChrisA