python中类的创建，父子类的继承_python 函数参数声明父子类-优快云博客

本文链接：https://blog.youkuaiyun.com/sruru/article/details/38405807

本文探讨Python编程中如何创建类、实现父子类的继承，并重点讲解如何在子类中调用父类的构造函数__init__。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

#!/usr/bin/python

class Ppoint:
   def __init__(self, x, y):
      self.x = x
      self.y = y

   # def __del__(self):
   #    class_name = self.__class__.__name__
   #    print class_name, "destroyed"


class Spring_Point(Ppoint):
    def __init__(self):
        Ppoint.__init__(self, 1, 2)
        # super(Spring_Point, self).__init__(1, 2)

if __name__ == "__main__":
    xx = Spring_Point()
    print xx.__dict__

以上是用old的方式来创建一个class， Ppoint, class Spring_Point继承Spring_Point，在调用父类的构造函数的时候，必须使用

Ppoint.__init__(self, 1, 2)

不能使用

super(Spring_Point, self).__init__(1, 2)

如果使用心得方式创建类

#!/usr/bin/python

class Ppoint(object):
   def __init__(self, x, y):
      self.x = x
      self.y = y

   # def __del__(self):
   #    class_name = self.__class__.__name__
   #    print class_name, "destroyed"


class Spring_Point(Ppoint):
    def __init__(self):
        Ppoint.__init__(self, 1, 2)
        # super(Spring_Point, self).__init__(1, 2)

if __name__ == "__main__":
    xx = Spring_Point()
    print xx.__dict__

则两种调用父类构造器的方法都可以，参考http://stackoverflow.com/questions/9698614/super-raises-typeerror-must-be-type-not-classobj-for-new-style-class

In short, they are equivalent. Let's have a history view:

(1) at first, the function looks like this.

    class MySubClass(MySuperClass):
        def __init__(self):
            MySuperClass.__init__(self)

(2) to make code more abstract (and more portable). A common method to get Super-Class is invented like:

    super(<class>, <instance>)

And init function can be:

    class MySubClassBetter(MySuperClass):
        def __init__(self):
            super(MySubClassBetter, self).__init__()

However requiring an explicit passing of both the class and instance break the DRY (Don't Repeat Yourself) rule a bit.

(3) in V3. It is more smart,

    super()