Python functional programming-return functions, python Functions

Python functional programming-return functions, python Functions
I. function as return value

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

 

Ii. Closure

>>> 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 >>>