python super()函数

super()函数是用来调用父类(超类)的一个方法

super()的语法:

python 2 的用法:

super(Class, self).xxx  # class是子类的名称

class A(object):
pass

class B(a):
def add(self, x):
super(B,self).add(x)

 

python 3用法:

super().xxx


class A:
pass


class B(A):
def add(self, x):
super().add(x)

实例:
# _*_ coding:utf-8 _*_


class FooParent:
def __init__(self):
self.parent = 'I\'m the parent'
print('parent')

def bar(self, message):
print('%s from Parent' % message)


class FooChild(FooParent):
def __init__(self):
super(FooChild, self).__init__() # 把FooChild对象转化成FooParent的对象,调用父类里的__init__(self),会输出‘parent'
self.child = 'this is child'
print('child') # 上一步调用结束后,打印‘child'

def bar(self, message):
super(FooChild, self).bar(message) # 调用父类里的bar函数
print('child bar function')
print(self.parent) # 打印父类的属性parent
print(self.child)
if __name__ == '__main__':
fooChild = FooChild()
fooChild.bar('HelloWorld')

输出结果

parent
child
HelloWorld from Parent
child bar function
I'm the parent
this is child

 

posted on 2018-03-12 17:35  永恒自由森林  阅读(437)  评论(0编辑  收藏  举报

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