图书馆代码python

以下是一个简单的图书馆代码Python实现的示例：

class Book:
    def __init__(self, title, author, ISBN, available=True):
        self.title = title
        self.author = author
        self.ISBN = ISBN
        self.available = available

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

        return results

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

        return results

    def search_by_isbn(self, isbn):
        results = []
        for book in self.books:
            if book.ISBN == isbn:
                results.append(book)

        return results

    def checkout_book(self, title):
        for book in self.books:
            if book.title.lower() == title.lower() and book.available:
                book.available = False
                return True

        return False

    def checkin_book(self, title):
        for book in self.books:
            if book.title.lower() == title.lower() and not book.available:
                book.available = True
                return True

        return False

使用示例：

# 创建几本书
book1 = Book("The Great Gatsby", "F. Scott Fitzgerald", "9780743273565", True)
book2 = Book("To Kill a Mockingbird", "Harper Lee", "9780446310789", True)
book3 = Book("Pride and Prejudice", "Jane Austen", "9780486284736", True)

# 创建一个图书馆并添加书籍
library = Library()
library.add_book(book1)
library.add_book(book2)
library.add_book(book3)

# 通过标题查找书籍
results = library.search_by_title("To Kill a Mockingbird")
for book in results:
    print(book)

# 借出一本书
if library.checkout_book("To Kill a Mockingbird"):
    print("Book checked out!")
else:
    print("Book not available.")

# 归还一本书
if library.checkin_book("To Kill a Mockingbird"):
    print("Book checked in!")
else:
    print("Book not checked out.")

希望这个简单的示例对你有所帮助。