What are the errors in this python code?

import os

print ("The OCR Controlled Assessment Arithmetic Maths Quiz")
name = input("What is your name? ")
print ("Welcome to our OCR Quiz ", name)

score = 0  
question = 0
while question = 9:
   operator = random.randint(1,3)
   num1 = random.randint(1,12)
   num2 = random.randint(1,12)
   if operator == 1:
      print ("What is {} + {}?".format(num1,num2))
      ans = num1 + num2
   elif operator == 2:
      print ("What is {} * {}?".format(num1,num2))
      ans = num1 * num2
   elif operator == 3:
      print ("What is {} - {}?".format(num1,num2))
      ans = num1 - num2

      while True:
         try:
            user_ans = int(input())
         except ValueError:
               print ("That is not a valid answer!")
               continue
         else:
            break
         if user_ans == ans:
            print("Correct!")
            question += 1
            score += 1
         else:
            print("Nice Try!")
            question += 1
            score += 0

            print ("you scored ()/10".format(score))
            if score == 9:
               print("Excellemt Job!")
            elif score == 6:
               print ("Well Done!")
            elif score == 4:
               print("Try Harder!")