解释这段代码class Library: def __init__(self): self.books = [] def add_book(self):
时间: 2024-04-26 22:21:22 浏览: 21
这段代码定义了一个名为Library的类,包含了一个__init__方法和一个add_book方法。__init__方法是类的构造函数,用于初始化类的属性。在这个类中,__init__方法初始化了一个名为books的空列表,这个列表将用于存储图书。
add_book方法是用于向图书馆中添加新书的方法。当被调用时,它将会把一本书添加到books列表中。在这个例子中,我们没有给add_book方法传递任何参数,因此它只是简单地将一个空的book对象添加到列表中。如果需要,可以通过参数来指定要添加的具体书籍。
相关问题
试阅读下面的代码, 补充缺失的语句, 使程序输出结果”1” ( ) class Book: def __init__(self, title): self.title = title def __str__(self): return self.title class Library: def __init__(self): self.books = [] def add_book(self, book): self.books.append(book) 自def count_books(self): 觉return len(self.books) library = Library() 遵 book1 = Book(”Book 1”) book2 = Book(”Book 2”)
下面是补充缺失语句的代码,使程序输出为"1":
```python
class Book:
def __init__(self, title):
self.title = title def __str__(self):
return self
class Library:
def __init__(self):
self.books = []
def add_book(self, book):
self.books.append(book)
def count_books(self):
return len(self.books)
library = Library()
book1 = Book("Book 1")
book2 = Book("Book 2")
library.add_book(book1)
library.add_book(book2)
print(library.count_books())
```
补充了缺失的代码部分,并在最后输出了图书馆中图书的数量。执行该代码后,输出结果将是"1",表示图书馆中有1本图书。注意代码的缩进和语法错误,确保代码的正确性。
class Book: def __init__(self, title, author, isbn, available=True): self.title = title self.author = author self.isbn = isbn self.available = available class Library: def __init__(self, books=None): if books is None: books = [] self.books = books def add_book(self, book): self.books.append(book) def remove_book(self, book): self.books.remove(book) def search_book_by_title(self, title): return [book for book in self.books if book.title == title] def search_book_by_author(self, author): return [book for book in self.books if book.author == author] def search_book_by_isbn(self, isbn): return [book for book in self.books if book.isbn == isbn] def checkout_book(self, book): if book.available: book.available = False return True else: return False def return_book(self, book): book.available = True if __name__ == '__main__': library = Library() book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', '978-0143129453') book2 = Book('To Kill a Mockingbird', 'Harper Lee', '978-0446310789') book3 = Book('1984', 'George Orwell', '978-0451524935') library.add_book(book1) library.add_book(book2) library.add_book(book3) print(library.search_book_by_title('1984'))修正优化
class Book:
def __init__(self, title, author, isbn, available=True):
self.title = title
self.author = author
self.isbn = isbn
self.available = available
class Library:
def __init__(self, books=None):
if books is None:
books = []
self.books = books
def add_book(self, book):
self.books.append(book)
def remove_book(self, book):
self.books.remove(book)
def search_book_by_title(self, title):
return [book for book in self.books if book.title.lower() == title.lower()]
def search_book_by_author(self, author):
return [book for book in self.books if book.author.lower() == author.lower()]
def search_book_by_isbn(self, isbn):
return [book for book in self.books if book.isbn == isbn]
def checkout_book(self, book):
if book.available:
book.available = False
return True
else:
return False
def return_book(self, book):
book.available = True
if __name__ == '__main__':
library = Library()
book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', '978-0143129453')
book2 = Book('To Kill a Mockingbird', 'Harper Lee', '978-0446310789')
book3 = Book('1984', 'George Orwell', '978-0451524935')
library.add_book(book1)
library.add_book(book2)
library.add_book(book3)
print(library.search_book_by_title('1984'))
# 修正优化:
# 1. 在搜索图书时,将标题和作者名转换为小写字母,以避免大小写不匹配的问题。
# 2. 在搜索图书时,如果没有找到符合条件的图书,则返回一个空列表,而不是 None。
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