Question

所以我试着通过这样做来学习，现在发生了这个错误：

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'

对于这段代码：

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

我应该如何减去变量的输入？

请帮忙！：d

Answer 1

您不能从整数中减去字符串。使用int：

newbal = bal - int(howmuch)

Answer 2

将字符串中的howmuch输入转换为整数：

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)

如何从现有变量中减去输入？

2 个答案: