Timed Math Challenge.py

#timed math challenge
import random
import time

OPERATORS = ["+", "-", "*"]
MIN_OPERAND = 3
MAX_OPERAND = 12
TOTAL_PROBLEMS = 10

def generate_problem():
    left = random.randint(MIN_OPERAND, MAX_OPERAND)
    right = random.randint(MIN_OPERAND, MAX_OPERAND)
    operator = random.choice(OPERATORS)
    
    expr = str(left) + " " + operator + " " + str(right)
    answer = eval(expr)
    return expr, answer

wrong = 0
input("Press enter to start!")
print("---------------------------")

start_time = time.time()

for i in range(TOTAL_PROBLEMS):
    expr,  answer = generate_problem()
    while True:
        guess= input("Problem #" + str(i+1) + ": " + expr + " = " )
        if guess == str(answer):
            break
        wrong += 1

end_time = time.time()
total_time = round(end_time - start_time)

print("---------------------------")
print("Good work! You finished in", total_time, "seconds!")

#End of program