2.创建一个图书类，类中包含的属性有：书名，作者、出版社；包含的方法有：设置书籍状态，查看书籍状态。书籍状态有在馆和外借两种。

class Book:
def __init__(self, title, author, publisher):
self.title = title
self.author = author
self.publisher = publisher
self.status = "在馆"

def set_status(self, status):
self.status = status

def get_status(self):
return self.status

book = Book("Python编程从入门到精通", "张三", "人民出版社")
print(book.get_status()) # 在馆
book.set_status("外借")
print(book.get_status()) # 外借