Lower School Arithmetic Quiz

import random

def division():
    global num1
    global num2
    while num1 % num2 != 0:
        num1 = random.randint(1,144)
        num2 = random.randint(1,144)

print("Weclome to the Lower School Arithmetic Quiz. Please enter your name below.") 
name = input().title() 
class_name = input("Which class do you wish to input results for? ")
print (name, ", Welcome to the arithmetic test!") 
score = 0  
question = 0
global num1
global num2
while question < 10: 
    operator = random.randint(1,4)
    num1 = random.randint(1,12)
    num2 = random.randint(1,12)
    question += 1
    if operator == 1: 
        print("What is", num1, "+", num2,"?")
        while True:
            try:
                user_ans = int(input(""))
                break
            except ValueError: 
                print ("That is not a valid answer")
        
        ans = num1 + num2

elif operator == 2:
        print("What is", num1, "*", num2,"?")
        while True:
            try:
                user_ans = int(input(""))
                break
            except ValueError:1 
            print ("That is not a valid answer")
        ans = num1 * num2
 
    elif operator == 3:
        division()
        if num2 > num1:
            print("What is", num2, "/", num1,"?")
            while True:
                try:
                    user_ans = int(input(""))
                    break
                except ValueError: 
                    print ("That is not a valid answer")
            ans = num2 // num1
        elif num1 > num2:
            #division()    
            print("What is", num1, "/", num2,"?")
            while True:
                try:
                    user_ans = int(input(""))
                    break
                except ValueError: 
                    print ("That is not a valid answer") 
            ans = num1 // num2

else: 
        print("What is", num1, "-", num2,"?")
        while True:
            try:
                user_ans = int(input(""))
                break
            except ValueError: 
                print ("That is not a valid answer")
        ans = num1 - num2

if user_ans == ans: 
        print("Correct")
        score += 1
    else: 
        print("Incorrect")

print("Well done", name, "you scored", score, "/10")

class_name = class_name + ".txt"

file = open(class_name , 'a')   
name = (name)
file.write(str(name + " : " ))
file.write(str(score))
file.write('\n')
file.close()

viewscore = input("Do you wish to view previous results for your class?").lower()

if viewscore == "yes".lower():
    f = open(class_name, 'r')
    file_contents = f.read()
    print (file_contents)
    f.close()

elif viewscore != "yes".lower():
    print ("Press any key to exit")
    ex = input ("")

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