book4 = Book('Pride and Prejudice', 'Jane Austen', '978-0486284736')library.add_book(book4)print(library.search_book_by_author('Jane Austen'))checked_out = library.checkout_book(book4)print(f"Book checked out: {checked_out}")returned = library.return_book(book4)print(f"Book returned: {returned}")加入

book4 = Book('Pride and Prejudice', 'Jane Austen', '978-0486284736')
library.add_book(book4)
print(library.search_book_by_author('Jane Austen'))
checked_out = library.checkout_book(book4)
print(f"Book checked out: {checked_out}")
returned = library.return_book(book4)
print(f"Book returned: {returned}")

相关问题

class Book: def __init__(self, title, author, isbn): self.title = title self.author = author self.isbn = isbn def __str__(self): return f"{self.title} by {self.author}"class Library: def __init__(self): self.books = [] def add_book(self, book): self.books.append(book) def search_book_by_title(self, title): results = [] for book in self.books: if title.lower() in book.title.lower(): results.append(book) return results def search_book_by_author(self, author): results = [] for book in self.books: if author.lower() in book.author.lower(): results.append(book) return results def checkout_book(self, book): if book in self.books: self.books.remove(book) return book else: return None def return_book(self, book): self.books.append(book) return book# sample usagebook1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', '978-0743273565')book2 = Book('To Kill a Mockingbird', 'Harper Lee', '978-0446310789')book3 = Book('1984', 'George Orwell', '978-0451524935')library = Library()library.add_book(book1)library.add_book(book2)library.add_book(book3)print(library.search_book_by_title('the'))print(library.search_book_by_author('scott fitzgerald'))book4 = Book('Pride and Prejudice', 'Jane Austen', '978-0486284736')library.add_book(book4)print(library.search_book_by_author('Jane Austen'))checked_out = library.checkout_book(book4)print(f"Book checked out: {checked_out}")returned = library.return_book(book4)print(f"Book returned: {returned}")能不能标识解释作用

这是一个 Python 代码示例，其中定义了两个类：`Book` 和 `Library`。

`Book` 类表示一本书，具有三个属性：`title`（书名），`author`（作者）和 `isbn`（ISBN 号码）。它还有一个 `__str__()` 方法，用于返回一个格式化的字符串表示该书的书名和作者。

`Library` 类表示一个图书馆，具有一个属性 `books`，它是一个书籍列表。它有四个方法：

- `add_book()`：添加一本书到图书馆中。
- `search_book_by_title()`：通过书名搜索图书馆中的书籍。
- `search_book_by_author()`：通过作者搜索图书馆中的书籍。
- `checkout_book()`：借出一本书。

这段示例代码还演示了如何使用这两个类，创建几本书并将它们添加到图书馆中，搜索图书馆中的书籍，并借出和归还一本书。

这段代码并不需要用户输入，它是一个样例程序，会自动运行并输出结果。如果你想测试其他功能，可以在代码中添加相应的操作，并运行程序。例如： 复制 book4 = Book('Pride and Prejudice', 'Jane Austen', '978-0486284736') library.add_book(book4) print(library.search_book_by_author('Jane Austen')) checked_out = library.checkout_book(book4) print(f"Book checked out: {checked_out}") returned = library.return_book(book4) print(f"Book returned: {returned}") 这样就添加了一本新书，然后搜索作者为“Jane Austen”的书籍，借出一本书并归还了它，并输出了相应的结果。能不能把加入程序给我

当然可以，以下是完整的程序代码：

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

    def __str__(self):
        return f"{self.title} by {self.author}"

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

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

    def search_book_by_title(self, title):
        results = []
        for book in self.books:
            if title.lower() in book.title.lower():
                results.append(book)
        return results

    def search_book_by_author(self, author):
        results = []
        for book in self.books:
            if author.lower() in book.author.lower():
                results.append(book)
        return results

    def checkout_book(self, book):
        if book in self.books:
            self.books.remove(book)
            return book
        else:
            return None

    def return_book(self, book):
        self.books.append(book)
        return book

# sample usage
book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', '978-0743273565')
book2 = Book('To Kill a Mockingbird', 'Harper Lee', '978-0446310789')
book3 = Book('1984', 'George Orwell', '978-0451524935')

library = Library()
library.add_book(book1)
library.add_book(book2)
library.add_book(book3)

print(library.search_book_by_title('the'))
print(library.search_book_by_author('scott fitzgerald'))

book4 = Book('Pride and Prejudice', 'Jane Austen', '978-0486284736')
library.add_book(book4)
print(library.search_book_by_author('Jane Austen'))

checked_out = library.checkout_book(book4)
print(f"Book checked out: {checked_out}")

returned = library.return_book(book4)
print(f"Book returned: {returned}")

运行上述代码，会依次输出搜索标题包含“the”的书籍、搜索作者为“scott fitzgerald”的书籍、搜索作者为“Jane Austen”的书籍、借出一本书并输出相应信息、归还一本书并输出相应信息。