Find words for phone numbers

phones.py

chars_for = {
	'-': ['-'],
	'0': ['0'],
	'1': ['1'],
	'2': ['A', 'B', 'C'],
	'3': ['D', 'E', 'F'],
	'4': ['G', 'H', 'I'],
	'5': ['J', 'K', 'L'],
	'6': ['M', 'N', 'O'],
	'7': ['P', 'Q', 'R', 'S'],
	'8': ['T', 'U', 'V'],
	'9': ['W', 'X', 'Y', 'Z'],
}

words = dict.fromkeys(open('/usr/share/dict/words', 'r').read().upper().splitlines())

def rank(phone):
	phone = phone.replace('-', ''); length = len(phone)
	subs = [phone[start:start+width] for width in range(3, length + 1) for start in range(length - width + 1)]
	return sum(map(lambda sub:len(sub)**3, filter(lambda sub:sub in words, subs)))
	
def phones(str, results, out = '', index = 0):
	if len(str) == len(out):
		value = rank(out)
		if value > 0: results[out] = value
		return
	chars = chars_for[str[index]]
	for c in chars:
		out = out + c
		phones(str, results, out, index + 1)
		out = out[:-1]

def process(str):
	results = {}
	phones(str, results)
	file = open('%s.txt' % str, 'w')
	for phone in sorted(results, key=results.get, reverse=True):
		file.write('%s: %d\n' % (phone, results[phone]))
	file.close()

process('[phone-number-here]')