###柯里化 f(x,y) -> g(x)(y)


 

 

python 柯里化 f(x,y) -> g(x)(y)

def
bigger(x): def inner_bigger(y): return y>x return inner_bigger list(filter(bigger(5),range(10))) #filter返回一个迭代器,用list接收 [6, 7, 8, 9] list(filter(bigger(3),range(10))) [4, 5, 6, 7, 8, 9]
实例化一下:
bigger_3 = bigger(3)
bigger_3(4)

True
bigger_3(2)
False

使用partial 也可以实现柯里化: 用于固定某些参数
def inc(f,x):
    return f+x
def bigger(x,y):
    return x >y
from functools import partial
help(partial)
Help on class partial in module functools:

class partial(builtins.object)
 |  partial(func, *args, **keywords) - new function with partial application
 |  of the given arguments and keywords.
 |  

partial(bigger,y=3)
functools.partial(<function bigger at 0x7f264455ad08>, y=3)
bigger_3 = partial(bigger,y=3)
callable(bigger_3) #判断一个函数是否可以被调用 用callable 
True

bigger_3(2)  #x=2 > y=3 返回false
False
bigger_3(4)  #x=4 > y=3 返回True
True

 def mang_args(x,y,z,a,b,c):
...     print ("x is {}".format(x))
...     print ("y is {}".format(y))
...     print ("z is {}".format(z))
...     print ("a is {}".format(a))
...     print ("b is {}".format(b))
...     print ("c is {}".format(c))

fn1 = partial(mang_args,a=1,b=2,c=3)
fn1(4,5,6)
x is 4
y is 5
z is 6
a is 1
b is 2
c is 3


 

 

 

posted @ 2016-03-17 15:19  Tom-Li  阅读(574)  评论(0编辑  收藏  举报