python ordinary methods, @classmethod, @staticmethod

• Ordinary method
  Instantiate a class, and then call the method through the instantiation of the class:

  class method1:
  def __init__(self):
      self.items = [1,2,3,]
  def getvalue(self):
      return self.items

• @classmedhod
  depends on the class but not on the example. When defining a method, the first parameter refers to the current class

  class method2:
  item = 1
  def __init__(self):
      self.items = [1,2,3,]
  @classmethod
  def getvalue(cls, args):
      print(cls.__name__)   # print: method2
      print(cls.item)             # print: 1
      return cls

• @staticmedhot
  static method, consistent with java, C#, but defined in the class, has nothing to do with the class

  class method3:
  item  = 1
  @staticmethod
  def getvalue():
      print(item)      # error