When to use class methods in python

In Python, class methods are defined using the decorator @classmethod.

Let’s look directly at the example. (Recommended learning:Python video tutorial)

class Kls(object): num_inst = 0 def __init__(self): Kls.num_inst = Kls.num_inst + 1 @classmethod def get_no_of_instance(cls): return cls.num_inst ik1 = Kls() ik2 = Kls() print ik1.get_no_of_instance() print Kls.get_no_of_instance()

Class method is used to simulate the situation where java defines multiple constructors.

Since there can only be one initialization method in a python class, the class cannot be initialized according to different situations.

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)

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