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Date: Mon, 2 Dec 2013 09:49:54 +1100
Subject: Re: Checking Common File Types
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:60846

On Mon, Dec 2, 2013 at 5:27 AM, jade <jadec375@msn.com> wrote:
> file_sigs = {'\xFF\xD8\xFF':('JPEG','jpg'),
>  '\x47\x49\x46':('GIF','gif')}
>
>     file_sig = fh.read(4)

You're reading in four bytes, but your signatures are three bytes long. :)

After that, all you need to do is look up file_sig in the file_sigs
dictionary, and see if anything's there. Look at the Python docs for
the dict type; there's an easy way to do this.

ChrisA