import sys InterestingInstructions = 0 input = open(sys.argv[1], "r") for line in input: i = line.find(';') if i >= 0: line = line[:i] if "%interesting" in line: InterestingInstructions += 1 print(InterestingInstructions) if InterestingInstructions == 5: sys.exit(0) # interesting! sys.exit(1)