practicepython.org's ex #18

cows_bulls.py

#!/usr/bin/python3.5

import random

def main():
	# the random number is in form of list
	num = [random.randint(0, 9) for i in range(4)]
	tries = 0
	print(num)

	while True:
		cows = 0
		bulls = 0
		guess = input('enter your guess: ')
		while len(guess) != 4:
			guess = input('please enter exactly 4 digit: ')
		# the guessed number is submitted as str, then it is
		# 	transformed to list of ints
		guess = [int(i) for i in guess]
		# cows or bulls?
		for i in enumerate(guess):
			if i[1] in num:
				if i[1] == num[i[0]]:
					cows += 1
				else:
					bulls += 1

		print('cows: ', cows, 'bulls: ', bulls)
		tries += 1
		if cows == 4:
			print('it took you', tries, 'to correctly guess the number')
			break

if __name__ == '__main__':
	main()

excellent solution. Could you explain why enumerate was used. Could be done using range. Any specific use for enumerate??