python中偏函数partial用法实例分析

In [9]: from functools import partial

In [10]: def add(a,b):
....: return a+b
....:

In [11]: add(4,3)
Out[11]: 7

In [12]: plus = partial(add,100)

In [13]: plus(9)
Out[13]: 109

In [14]: plus2 = partial(add,99)

In [15]: plus2(9)
Out[15]: 108

In [17]: def add2(a,b,c=2):
....: return a+b+c
....:

In [18]: plus3 = partail(add,101)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/Users/yupeng/Documents/PhantomJS/<ipython-input-18-d4b7c6a6855d> in <module>()
----> 1 plus3 = partail(add,101)

NameError: name 'partail' is not defined

In [19]: plus3 = partial(add,101)

In [20]: plus3(1)
Out[20]: 102

In [21]: plus3 = partial(add2,101)

In [22]: plus3 = partial(add2,101) (1)
Out[22]: 104

In [23]: plus3(1)
Out[23]: 104

In [24]: plus3(1,2)
Out[24]: 104

In [25]: plus3(1,3)
Out[25]: 105

In [26]: plus3(1,30)
Out[26]: 132