python函数式编程filter，reduce

过滤出奇数：

>>> list(filter(lambda x:x%2,range(10)))
[1, 3, 5, 7, 9]

 累加：

>>> from functools import reduce
>>> reduce(lambda x,y:x+y,(1,2,3,4))
10

 自定义reduce:

>>> def myreduce(func,seq):
    total=seq[0]
    for next in seq[1:]:
        total=func(total,next)
    return total

>>> myreduce(lambda x,y:x+y,(1,3,2,5))
11
>>> myreduce(lambda i,j:i*j,[3,4,5])
60