TypeError：不支持的操作数类型 - ：'str'和第4行的'str'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)

第4行没有工作，money_left已经是变量

获取TypeError：不支持的操作数类型 - ：'str'和'str'

Answer 1

将赌博投射到一个数字

money_left = int(money_left) - int(gamble)