python什么时候用类方法

coding:utf-8

class Book(object):

def __init__(self, title):

self.title = title

   @classmethod

def class_method_create(cls, title):

book = cls(title=title)

return book

   @staticmethod

def static_method_create(title):

book= Book(title)

return book

book1 = Book("use instance_method_create book instance")

book2 = Book.class_method_create("use class_method_create book instance")

book3 = Book.static_method_create("use static_method_create book instance")

print(book1.title)

print(book2.title)

print(book3.title)