python - 调用python函数时出错，TypeError : returnbook() missing 1 required positional argument: 'self'

Question

我创建了一个 Python 程序，客户可以在其中归还图书和从图书馆借书，但在执行时出现错误 * TypeError:borrow() missing 1 required positional argument: 'self' *

我应该做哪些更改才能成功执行程序？

由于图书馆目前没有书籍，我将首先调用 returnbook() 函数。

class Library:
    def __init__(self):
        self.availablebook = availablebook
    def reducebook(self,book):
        if book in self.availablebook:
            self.availablebook.remove(book)
            print('book is removed')
    def addbook(self,book):
        self.availablebook.append(book)
        print('book added')

class Customer:
    def borrow(self):
        print('enter book')
        book = input()
        Library.reducebook(book)
    def returnbook(self):
        print('enter book')
        book = input()
        Library.addbook(book)

while True:
    print('enter 1 for add book,2 for borrow book,3 to exit')
    self.x = int(input())
    if(x==1):
        Customer.borrow()
    elif(x==2):
        Customer.returnbook()
    else:
        print('exiting')
        quit()

Answer 1

创建 Customer 的实例类，不要直接使用类:

customer = Customer()
customer.borrow()
customer.returnbook()