Convert words from a line-separated file to T9 keypresses

t9ify.py

#!/usr/bin/env python

import re
keys = [
	'.,@1?!*#/\':;',
	'abc2',
	'def3',
	'ghi4',
	'jkl5',
	'mno6',
	'pqrs7',
	'tuv8',
	'wxyz9',
]
letter_exp = re.compile('|'.join('[' + re.escape(letters) + ']' for letters in keys))
def letter_sub(match):
	for letters in keys:
		key_num = letters.find(match.group(0))
		if key_num > -1:
			return str(keys.index(letters) + 1) * (key_num + 1) + ' '

consecutive_keypresses_exp = re.compile('|'.join('[' + str(num) + ' ]+' for num in xrange(1,10)))
longest_run = 0
longest_run_word = None

import fileinput
for line in fileinput.input():
	word = line.strip()
	word_t9 = letter_exp.sub(letter_sub, word.lower()).strip()
	print word, word_t9

	for match in consecutive_keypresses_exp.finditer(word_t9):
		keypresses = ''.join(match.group(0).split())
		if len(keypresses) > longest_run:
			longest_run = len(keypresses)
			longest_run_word = word
else:
	print 'Longest number of keypresses:', longest_run_word, 'at', longest_run, 'consecutive presses of the same key'