partial函数-python学习

def add(a,b,c=2):
    print("a is:%s b is %s c is %s"%(a,b,c))
    return a+b+c
add_with_a_b=partial(add,2,3)
print(add_with_a_b())# it‘s 7
add_with_a=partial(add,9)
print(add_with_a(10))# it‘s 21
#################

a is:2 b is 3 c is 2
7
a is:9 b is 10 c is 2
21

#coding:utf-8
‘‘‘
Created on 2014-10-1
@author: zkchen
‘‘‘
from functools import partial
PARAMS=("__doc__",)
def update_params(target,source,params=PARAMS):
    #将target的在PARAMS中提到的属性设置为source的
    [setattr(target,p,getattr(source,p,None)) for p in PARAMS]
    return target
def update_params_wrap(source):
    return partial(update_params,source=source,params=PARAMS)

def test_partial():
    def funcA():
        ‘‘‘this is funcA‘s doc‘‘‘
        pass
    @update_params_wrap(funcA)
    def funcB():
        ‘‘‘this is funcB‘s doc‘‘‘
        pass
    print(funcB.__doc__)
#################################

this is funcA‘s doc