cows_and_bull_games.py

# Import required module 
import random 

# Returns list of digits 
# of a number 
def getDigits(num): 
	return [int(i) for i in str(num)] 
	

# Returns True if number has 
# no duplicate digits 
# otherwise False	 
def noDuplicates(num): 
	num_li = getDigits(num) 
	if len(num_li) == len(set(num_li)): 
		return True
	else: 
		return False


# Generates a 4 digit number 
# with no repeated digits	 
def generateNum(): 
	while True: 
		num = random.randint(1000,9999) 
		if noDuplicates(num): 
			return num 


# Returns common digits with exact 
# matches (bulls) and the common 
# digits in wrong position (cows) 
def numOfBullsCows(num,guess): 
	bull_cow = [0,0] 
	num_li = getDigits(num) 
	guess_li = getDigits(guess) 
	
	for i,j in zip(num_li,guess_li): 
		
		# common digit present 
		if j in num_li: 
		
			# common digit exact match 
			if j == i: 
				bull_cow[0] += 1
			
			# common digit match but in wrong position 
			else: 
				bull_cow[1] += 1
				
	return bull_cow 
	
	
# Secret Code 
num = generateNum() 
tries =int(input('Enter number of tries: ')) 

# Play game until correct guess 
# or till no tries left 
while tries > 0: 
	guess = int(input("Enter your guess: ")) 
	
	if not noDuplicates(guess): 
		print("Number should not have repeated digits. Try again.") 
		continue
	if guess < 1000 or guess > 9999: 
		print("Enter 4 digit number only. Try again.") 
		continue
	
	bull_cow = numOfBullsCows(num,guess) 
	print(f"{bull_cow[0]} bulls, {bull_cow[1]} cows") 
	tries -=1
	
	if bull_cow[0] == 4: 
		print("You guessed right!") 
		break
else: 
	print(f"You ran out of tries. Number was {num}")