书管理系统代码设计

设计一个书管理系统涉及多个方面，包括图书的添加、删除、查询，借阅和归还管理，用户信息管理等。

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

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

class Library:
    def __init__(self):
        self.books = []
        self.users = []
        self.borrowed_books = {}

    def add_book(self, title, author, isbn, available_copies):
        book = Book(title, author, isbn, available_copies)
        self.books.append(book)

    def remove_book(self, isbn):
        for book in self.books:
            if book.isbn == isbn:
                self.books.remove(book)
                break

    def display_books(self):
        for book in self.books:
            print(f"{book.title} by {book.author} (ISBN: {book.isbn}), Available Copies: {book.available_copies}")

    def add_user(self, user_id, name):
        user = User(user_id, name)
        self.users.append(user)

    def borrow_book(self, user_id, isbn):
        for book in self.books:
            if book.isbn == isbn and book.available_copies > 0:
                if user_id not in self.borrowed_books:
                    self.borrowed_books[user_id] = []
                self.borrowed_books[user_id].append(book)
                book.available_copies -= 1
                print(f"{book.title} borrowed successfully by user {user_id}")
                break
        else:
            print("Book not available for borrowing.")

    def return_book(self, user_id, isbn):
        if user_id in self.borrowed_books and len(self.borrowed_books[user_id]) > 0:
            for book in self.borrowed_books[user_id]:
                if book.isbn == isbn:
                    book.available_copies += 1
                    self.borrowed_books[user_id].remove(book)
                    print(f"{book.title} returned successfully by user {user_id}")
                    break
            else:
                print("User has not borrowed this book.")
        else:
            print("User has not borrowed any books.")

# 示例用法
library = Library()
library.add_book("The Catcher in the Rye", "J.D. Salinger", "978-0-316-76948-0", 5)
library.add_book("To Kill a Mockingbird", "Harper Lee", "978-0-06-112008-4", 3)
library.add_user(1, "Alice")
library.add_user(2, "Bob")

library.display_books()

library.borrow_book(1, "978-0-316-76948-0")
library.borrow_book(2, "978-0-316-76948-0")

library.display_books()

library.return_book(1, "978-0-316-76948-0")
library.return_book(2, "978-0-316-76948-0")

library.display_books()

python
class Library:
    # ... (之前的代码)

    def search_books(self, keyword):
        found_books = []
        for book in self.books:
            if keyword.lower() in book.title.lower() or keyword.lower() in book.author.lower():
                found_books.append(book)
        if found_books:
            for book in found_books:
                print(f"{book.title} by {book.author} (ISBN: {book.isbn}), Available Copies: {book.available_copies}")
        else:
            print("No matching books found.")

    def view_user_info(self, user_id):
        for user in self.users:
            if user.user_id == user_id:
                print(f"User ID: {user.user_id}, Name: {user.name}")
                borrowed_books = self.borrowed_books.get(user_id, [])
                if borrowed_books:
                    print("Borrowed Books:")
                    for book in borrowed_books:
                        print(f"{book.title} by {book.author} (ISBN: {book.isbn})")
                else:
                    print("No books borrowed.")
                break
        else:
            print("User not found.")

    def view_borrow_history(self, user_id):
        borrowed_books = self.borrowed_books.get(user_id, [])
        if borrowed_books:
            print(f"Borrow History for User {user_id}:")
            for book in borrowed_books:
                print(f"{book.title} by {book.author} (ISBN: {book.isbn})")
        else:
            print("No borrowing history for this user.")

# 示例用法
library.search_books("Mockingbird")

library.view_user_info(1)

library.view_borrow_history(1)

这个扩展示例包括了图书搜索、查看用户信息和查看借阅历史记录等功能。你可以根据具体需求进一步调整和扩展这个系统。