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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: I am out of trial and error again  Lists
Date: Thu, 23 Oct 2014 09:23:29 -0400
Organization: IISS Elusive Unicorn
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On Thu, 23 Oct 2014 00:10:28 -0700, Larry Hudson
<orgnut@yahoo.com.dmarc.invalid> declaimed the following:


>I know you are trying to explore lists here, but I found myself somewhat intrigued with the 
>problem itself, so I wrote a different version.  This version does not use lists but only 
>strings.  I'm just presenting it as-is to let you try to follow the logic, but if you ask, I'll 
>explain it in detail.  It turns your long sequence of if's essentially into a single line -- 
>unfortunately 's' and 'z' have to be handled as special-cases, which turns that single line into 
>a six-line if/elif/else set.  You might consider this line 'tricky', but I'll just say it's just 
>looking at the problem from a different viewpoint.  BTW, this version accepts upper-case as well 
>as lower-case.  isdigit() and isalpha() are standard string methods.
>

<SNIP>

	This is another example where changing data structures can simplify
things a lot...

-=-=-=-=-=-=-
keys = {    "a" : "2",  "b" : "2",  "c" : "2",  # 1 is not assigned
            "d" : "3",  "e" : "3",  "f" : "3",
            "g" : "4",  "h" : "4",  "i" : "4",
            "j" : "5",  "k" : "5",  "l" : "5",
            "m" : "6",  "n" : "6",  "o" : "6",
            "p" : "7",  "q" : "7",  "r" : "7",  "s" : "7",
            "t" : "8",  "u" : "8",  "v" : "8",
            "w" : "9",  "x" : "9",  "y" : "9",  "z" : "9"   }

def textToNumber(inp):
    outp = []
    for c in inp.lower():
        outp.append(keys.get(c, c))
    return "".join(outp)

if __name__ == "__main__":
    while True:
        #NOTE: Python 2.7!
        aNumStr = raw_input("\nEnter Phone Number String: ")
        if not aNumStr: break
        print "Converted to all numbers: %s" % textToNumber(aNumStr)

-=-=-=-=-=-=-
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Wulfraed\Documents\Python Progs>Phone.py

Enter Phone Number String: 1-800-getcharter
Converted to all numbers: 1-800-4382427837

Enter Phone Number String: 1-800-leo laporte
Converted to all numbers: 1-800-536 5276783

Enter Phone Number String: 1 800 callaprogrammer
Converted to all numbers: 1 800 225527764726637

Enter Phone Number String: +1(800)Leo-Laporte
Converted to all numbers: +1(800)536-5276783

Enter Phone Number String:

C:\Users\Wulfraed\Documents\Python Progs>
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/