gistfile1.py

import csv
from itertools import permutations, izip

filename = 'u2head.csv'

minimal_pairs = 0
wordlist = ['x']

letter1 = '1'
letter2 = '2'

count1 = 0
count2 = 0

with open('u2.csv', 'r') as csvfile:
	csv = csv.reader(csvfile, delimiter=';')
	wordlist = [(row[0], int(row[1])) for row in csv]

print "---"

for n1, word1 in enumerate(wordlist):
	w1 = word1[0]
	for word2 in wordlist[n1+1:]:
		w2 = word2[0]

		if len(w1) == len(w2):
			difference = 0
			for a, b in izip(w1, w2):
				if a == b:
					difference += 0
				elif (a == letter1 and b == letter2) or (a == letter2 and b == letter1):
					difference += 1
				else:
					difference += 2
			if difference == 1:
				#minimal_pairs += 1
				if letter1 in w1 and letter2 in w2:
					count1 += word1[1]
					count2 += word2[1]
				if letter1 in w2 and letter2 in w1:
					count1 += word2[1]
					count2 += word1[1]
				print word1, word2


print 'count1', count1
print 'count2', count2