python函數式編程-返回函數，python函數

python函數式編程-返回函數，python函數
一：函數作為傳回值

>>> def lazy_sum(*args):...     def sum():...         ax = 0...         for n in args:...             ax = ax + n...         return ax...     return sum... >>> f=lazy_sum(1,2,3,4,5)>>> >>> f<function sum at 0x7fd1b3eccaa0>>>> f()15>>> f1=lazy_sum(1,2,3,4,5)>>> f1()15>>> 

 

二：閉包

>>> def count():...     fs=[]...     for i in range(1,4):...         def f():...             return i*i...         fs.append(f)...     return fs... >>> f1, f2, f3 = count()>>> f1<function f at 0x7fd1b3edfed8>>>> f1()9>>> f2()9>>> f3()9>>>