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Date: Wed, 23 Jan 2013 02:07:57 +1100
Subject: Re: Using filepath method to identify an .html page
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:37280

On Wed, Jan 23, 2013 at 1:55 AM, Ferrous Cranus <nikos.gr33k@gmail.com> wrote:
> I insist, perhaps compeleld, to use a key to associate a number to a filename.
> Would you help please?
>
> I dont know this is supposed to be written. i just know i need this:
>
> number = function_that_returns_a_number_out_of_a_string( absolute_path_of_a_html_file)
>
> Would someone help me write that in python coding? We are talkign 1 line of code here....

def function_that_returns_a_number_out_of_a_string(string, cache=[]):
	return cache.index(string) if string in cache else
(cache.append(string) or len(cache)-1)

That will work perfectly, as long as you don't care how long the
numbers end up, and as long as you have a single Python script doing
the work, and as long as you make sure you save and load that cache
any time you shut down the script, and so on.

It will also, and rightly, be decried as a bad idea. But hey, you did
specify that it be one line of code. For your real job, USE A DATABASE
COLUMN.

ChrisA