TypeError:第4行的“str”和“str”的操作数类型不受支持如何修复

Question

print("you have chosen black")
gamble = input("how much do you want to gamble")
print("you have gambled",gamble)
money_left = money_left - gamble
print("you have",money_left,"left")
spin = random.randint(1,20)
print("It landed on....")
time.sleep(3)
print(spin)

4号线不工作，钱琰留下的已经是一个变量

获取类型错误：不支持-：“str”和“str”的操作数类型

Answer 1

赌一个数

money_left = int(money_left) - int(gamble)