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Python函数嵌套实例

WBOY
WBOYOriginal
2016-06-16 08:41:521493browse

在Python中函数可以作为参数进行传递,而也可以赋值给其他变量(类似Javascript,或者C/C++中的函数指针);

类似Javascript,Python支持函数嵌套,Javascript嵌套函数的应用模式对Python适用;

复制代码 代码如下:

>>> def multiplier(factor):
... def multiple(number):
... return number * factor
... return multiple
...
>>>
>>> multiplier(3)(3)
9
>>> multiplier(4)(3)

与嵌套函数紧密相关的就是闭包特性,举一个简单的例子:

复制代码 代码如下:

>>> def test():
... a = {'name': 'wyj'}
... def f():
... return a['name']
... return f
...
>>> def test():
... a = {'name': 'wyj'}
... def f():
... return a['name']
... return a,f
...
>>> a,f = test()
>>> f()
'wyj'
>>> a['name'] = 'ljq'
>>> f()
'ljq'

例子3

#! /usr/bin/python
def yao1(a=1,b=32):
	def yao2(c=54):
		def yao3(d=3):
			def yao4(e=10):
				return a+b+c+d+e
			return yao4
		return yao3
	return yao2

print yao1()()()()

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