Python 如何从现有变量中减去输入？

因此，我试图通过实践学习，现在出现了以下错误：

Traceback (most recent call last):
  File "C:/Users/Marcel/PycharmProjects/untitled/bank.py", line 14, in <module>
    newbal = bal - howmuch
TypeError: unsupported operand type(s) for -: 'int' and 'str'

我应该如何从变量中减去输入

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请帮忙D

不能从整数中减去字符串。使用：

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将字符串中的

输入量转换为整数：

howmuch = int(input("How much?: "))

完整代码：

id = input("Enter Bank ID: ")
bal = 1500

if id == "12345":
    print ("Correct!")
    print("You have a total Balance of",bal,"$")
    choi = input("What do you want to do? (Q)uit or (T)ake Money: ")

    if choi == "Q":
        quit()
    if choi == "T":
        howmuch = int(input("How much?: "))
        newbal = bal - howmuch
        print ("You took",howmuch,"$ from your Bank Account!")
        print ("Total Balance:",newbal)

将其转换为
int
：）谢谢！差点忘了：D如果你的问题解决了，请接受答案。
howmuch = int(input("How much?: "))

id = input("Enter Bank ID: ")
bal = 1500

if id == "12345":
    print ("Correct!")
    print("You have a total Balance of",bal,"$")
    choi = input("What do you want to do? (Q)uit or (T)ake Money: ")

    if choi == "Q":
        quit()
    if choi == "T":
        howmuch = int(input("How much?: "))
        newbal = bal - howmuch
        print ("You took",howmuch,"$ from your Bank Account!")
        print ("Total Balance:",newbal)