图书借阅管理系统python面向对象

好的，以下是一个简单的图书借阅管理系统的Python面向对象代码示例：

class Book:
    def __init__(self, title, author, isbn, num_copies):
        self.title = title
        self.author = author
        self.isbn = isbn
        self.num_copies = num_copies

    def display(self):
        print(f"Title: {self.title}")
        print(f"Author: {self.author}")
        print(f"ISBN: {self.isbn}")
        print(f"Number of copies: {self.num_copies}")

class Library:
    books = []

    def add_book(self, book):
        self.books.append(book)

    def remove_book(self, book):
        self.books.remove(book)

    def display_books(self):
        for book in self.books:
            book.display()

class Borrower:
    def __init__(self, name):
        self.name = name
        self.borrowed_books = []

    def borrow_book(self, library, book):
        if book in library.books and book.num_copies > 0:
            self.borrowed_books.append(book)
            book.num_copies -= 1
            print(f"{self.name} has borrowed {book.title}")
        else:
            print(f"{self.name} cannot borrow {book.title}")

    def return_book(self, library, book):
        if book in self.borrowed_books:
            self.borrowed_books.remove(book)
            book.num_copies += 1
            print(f"{self.name} has returned {book.title}")
        else:
            print(f"{self.name} did not borrow {book.title}")

# Example usage
book1 = Book("Python for Data Science Handbook", "Jake VanderPlas", "978-1491912058", 2)
book2 = Book("Python Crash Course", "Eric Matthes", "978-1593279288", 3)

library = Library()
library.add_book(book1)
library.add_book(book2)

borrower1 = Borrower("Alice")
borrower1.borrow_book(library, book1)
borrower1.return_book(library, book1)

library.display_books()

在这个示例中，我们定义了三个类：`Book`、`Library`和`Borrower`。`Book`类表示一本书，包含书的标题、作者、ISBN和副本数量。`Library`类表示图书馆，包含已添加的书籍列表和添加/删除/显示书籍的方法。`Borrower`类表示一个借书人，包含姓名和已借书籍列表，以及借书和还书的方法。

我们可以创建一些书籍、图书馆和借书人对象，并使用它们的方法来模拟借阅过程。