class Parent(object):
  Value = "Hi, Parent value"
 
  def fun(self):
    print("This is from Parent")
 
 
# 定义子类，继承父类
class Child(Parent):
  Value = "Hi, Child value"
 
  def ffun(self):
    print("This is from Child")
 
 
c = Child()
c.fun()
c.ffun()
print(Child.Value)
 
# 输出结果
# This is from Parent
# This is from Child
# Hi, Child value

class Parent(object):
  Value = "Hi, Parent value"
 
  def fun(self):
    print("This is from Parent")
 
 
class Child(Parent):
  Value = "Hi, Child value"
 
  def fun(self):
    print("This is from Child")
    # 调用父类Parent的fun函数方法
    Parent.fun(self)
 
 
c = Child()
c.fun()
 
# 输出结果
# This is from Child
# This is from Parent
# 实例化子类Child的fun函数时，首先会打印上条的语句，再次调用父类的fun函数方法

class Parent(object):
  Value = "Hi, Parent value"
 
  def fun(self):
    print("This is from Parent")
 
 
class Child(Parent):
  Value = "Hi, Child value"
 
  def fun(self):
    print("This is from Child")
    # Parent.fun(self)
    # 相当于用super的方法与上一调用父类的语句置换
    super(Child, self).fun()
 
 
c = Child()
c.fun()
 
# 输出结果
# This is from Child
# This is from Parent
# 实例化子类Child的fun函数时，首先会打印上条的语句，再次调用父类的fun函数方法