Python partial 工具函数

partial函数可以提高代码利用率和简洁性：

from functools import partial
def power(base, exponent, bias):
    return base * exponent + bias
squared = partial(power, exponent=2, bias=100)

In [7]: power(2,2,100)                                                          
Out[7]: 104

In [8]: squared(2)                                                              
Out[8]: 104

In [9]: squared(2, bias=1000)                                                   
Out[9]: 1004