class class_1():
    def fun_1(self, x):
        y = x+1
        print(y)
class class_2(class_1):
    def fun_2(self, x):
        super().fun_1(x) # 调用父类的方法
obj = class_2()
obj.fun_2(2)

class foo_parent(object): # object 可不写 但不能写成其他
    def __init__(self):
        self.parent = "我是父类!"
        print("Parent!")
    def bar(self, message):
        print("%s from Parent!" % message)
class foo_child(foo_parent):
    def __init__(self):
        super(foo_child, self).__init__() # 1) 找到foo_child的父类 2) 将foo_child的对象转换为父类的对象
        print("Child!")
    def bar_child(self, message):
        super(foo_child, self).bar(message)
        print("这是子类的bar函数!")
        print(self.parent)
foo_parent().bar("父类!") 
print("\n")
foo_child().bar("父类!")
print("\n")
foo_child().bar_child("子类!")