Thanks for the hint! Will do that later!
word_twice_count = 0
word_three_times_count = 0
with open('input.txt', 'r') as input_file:
for line in input_file:
line_counter = Counter(line)
if 2 in line_counter.values():
word_twice_count += 1
if 3 in line_counter.values():
word_three_times_count += 1
checksum = word_twice_count * word_three_times_count
print 'checksum is ' + str(checksum)
My edited solution for part one with collections Counter
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