Idiomatic Python手记一: average in FP way

 方法一:

import operator

def average(*args):
    return reduce(operator.add, args) / len(args) if args else 0

注释:

• 语句 if []: / if (): / if '' : / if {}: 对于以上空集 逻辑值为 False
• 等同于 if len(list) == 0 : pass 等

 方法二:

import functools

def average(*args):
    acc = functools.partial(reduce, lambda x, y : x + y)
    # acc = functools.partial(reduce, operator.add)
    return acc(args) / len(args) if args else 0

注释:

• acc 为初值为lambda 表达式的reduce偏函数