图书馆管理系统代码

由于图书馆管理系统是一个较为复杂的项目，代码比较长，无法在此一一列出。以下是一个简单的图书馆管理系统的代码框架，供参考：

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

class Library:
    def __init__(self):
        self.books = []

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

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

    def search_book(self, title):
        for book in self.books:
            if book.title == title:
                return book

    def display_books(self):
        for book in self.books:
            print(f"{book.title} by {book.author} (ISBN: {book.isbn}) - {book.quantity} copies available")

class User:
    def __init__(self, name, email):
        self.name = name
        self.email = email

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

    def borrow_book(self, library, title):
        book = library.search_book(title)
        if book:
            if book.quantity > 0:
                self.borrowed_books.append(book)
                book.quantity -= 1
                print(f"{self.name} has successfully borrowed {book.title}")
            else:
                print(f"Sorry, {book.title} is currently out of stock")
        else:
            print(f"Sorry, {title} is not available in the library")

    def return_book(self, library, title):
        for book in self.borrowed_books:
            if book.title == title:
                self.borrowed_books.remove(book)
                book.quantity += 1
                library.add_book(book)
                print(f"{self.name} has successfully returned {book.title}")
                return
        print(f"Sorry, {self.name} did not borrow {title}")

class Librarian(User):
    def __init__(self, name, email):
        super().__init__(name, email)

    def add_book(self, library, book):
        library.add_book(book)
        print(f"{book.title} has been added to the library")

    def remove_book(self, library, book):
        library.remove_book(book)
        print(f"{book.title} has been removed from the library")

    def display_borrowed_books(self, borrower):
        for book in borrower.borrowed_books:
            print(f"{book.title} by {book.author}")

# example usage
library = Library()
book1 = Book("Harry Potter and the Philosopher's Stone", "J.K. Rowling", "9780747532743", 5)
book2 = Book("The Lord of the Rings", "J.R.R. Tolkien", "9780261102385", 3)
library.add_book(book1)
library.add_book(book2)
library.display_books()

borrower = Borrower("Alice", "alice@example.com")
borrower.borrow_book(library, "Harry Potter and the Philosopher's Stone")
borrower.borrow_book(library, "The Lord of the Rings")
borrower.return_book(library, "Harry Potter and the Philosopher's Stone")

librarian = Librarian("Bob", "bob@example.com")
librarian.add_book(library, Book("The Hobbit", "J.R.R. Tolkien", "9780547928227", 2))
librarian.remove_book(library, book2)
librarian.display_borrowed_books(borrower)

此代码框架包含了图书馆、书籍、用户、借阅者和管理员等类的定义，并提供了一些基本的操作，如添加/删除书籍、查找书籍、借阅/归还书籍等。您可以根据自己的需求修改和完善这个框架，以实现一个更完整、更实用的图书馆管理系统。