继承part1

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面向对象编程三大特性：继承，多态，封装
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什么是类的继承：类的继承跟现实生活中的父、子、孙子、重孙子继承关系一样，父类又称为基类；python中类的继承分为：单继承和多继承
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class Dad:
   money = 100
   def __init__(self, name):
      print(‘实例化过程...‘)
      self.name = name

   def hit_son(self):
      print(‘%s正在打儿子‘ % self.name)

class Son(Dad):
   pass

print(Son.money)
# Son.hit_son() # 报错，缺少一个参数self

print(Dad.__dict__) # {‘__module__‘: ‘__main__‘, ‘money‘: 100, ‘__init__‘: <function Dad.__init__ at 0x000001E4EFBE8040>, ‘hit_son‘: <function Dad.hit_son at 0x000001E4EFBE8670>, ‘__dict__‘: <attribute ‘__dict__‘ of ‘Dad‘ objects>, ‘__weakref__‘: <attribute ‘__weakref__‘ of ‘Dad‘ objects>, ‘__doc__‘: None}
print(Son.__dict__) # {‘__module__‘: ‘__main__‘, ‘__doc__‘: None}

s1 = Son(‘alex‘) # 类Son实例化时需要传入一个参数name，相当于执行的是父类的__init__(自己本身没有__init__，所以就到父类中去找)
print(s1.__dict__) # {‘name‘: ‘alex‘}
print(s1.name)
print(s1.money)
s1.hit_son()


# 子类继承了父类所有的属性，如果子类定义的属性和父类重名了，并不是覆盖，而是先在自己属性字典里找，有的话就不在父类属性字典找
class Dad_1:
   money = 100
   def __init__(self, name):
      print(‘实例化过程...‘)
      self.name = name

   def hit_son(self):
      print(‘%s正在打儿子‘ % self.name)

class Son_1(Dad):
   money = 10000
   def __init__(self, name, age):
      self.name = name
      self.age = age

   def hit_son(self):
      print(‘来自子类的方法...‘)
print(Son_1.__dict__) # {‘__module__‘: ‘__main__‘, ‘money‘: 10000, ‘__doc__‘: None}
print(Son_1.money) # 10000

s2 = Son_1(‘wupeiqi‘, 20) # 此时子类本身有__init__，所以初始化时按照子类的初始化方法进行传参
print(s2.__dict__) # {‘name‘: ‘wupeiqi‘, ‘age‘: 20}
print(s2.money)
s2.hit_son()

继承part1

原文：https://www.cnblogs.com/xuewei95/p/14672111.html