Cows and Bulls Python - program error

Question

In this programm the user can give a 4 digit number as a guess for the generated number. When a digit is guessed right at the correct place, you get a cow, if it's in the generated number but at the wrong place, you get a bull. Current Problem: TypeError: Can't convert 'int' object to str implicitly

[ from random import randint

def getnumber():
a1 = str(randint(0, 9))
b1 = str(randint(0, 9))
c1 = str(randint(0, 9))
d1 = str(randint(0, 9))
return a1, b1, c1, d1

def game():
a, b, c, d = getnumber()
number = a + b + c + d
print ("Welcome to the Cows and Bulls Game! \n")
guess = input("Enter a number: ")
bulls, cows = 0, 0

while guess != number:
z = 0
for x in guess:
if x in guess:
if guess.index(x) == number.index(z):
cows += 1
else:
bulls += 1
z += 1
print("{0} cows, {1} bulls".format(str(cows), str(bulls)))
bulls = 0
cows = 0
guess == input("")

if guess == number:
print("This is the right number!")

if __name__ == "__main__" :
game() ]

Answer 1

You get an indentation error because you have to indent the last line as follows:

if __name__ == '__main__' :
game()