###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