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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Wed, 5 Dec 2012 11:18:56 -0700
Subject: Re: Help "joining" two files delimited with pipe character ("|")
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Xref: csiph.com comp.lang.python:34307

On Wed, Dec 5, 2012 at 10:57 AM, Daniel Doo <dd@topekacapitalmarkets.com> w=
rote:
> I am new to Python.  Is there a method to =93join=94 two pipe delimited f=
iles
> using a unique key that appears in both files?  I would like to implement
> something similar to the Unix join command.

If the files are small enough to fit in virtual memory, load one of
the files into a dict where the key is the join field and the value is
the full line.  Then iterate over the other file one line at a time,
checking to see if the join field is in the dict.  If it is, output
the joined line.  Otherwise, skip it.