Python内置函数之filter map reduce介绍

> N=range(10)
> print filter(lambda x:x>5,N)
[6, 7, 8, 9]

> N1=[1,2,3]
> N2=[6,5,4]
> map(lambda x,y:x+y,N1,N2)
[7, 7, 7]
> map(lambda x:x+3,N1)
[4, 5, 6]

> N=range(1,101)
> reduce(lambda x,y:x+y,N)
5050

>print reduce(lambda x,y:x*y,range(1,6))
>print reduce(lambda x,y:x*y,range(1,5))
>print reduce(lambda x,y:x*y,range(1,4))
>print reduce(lambda x,y:x*y,range(1,3))
>print reduce(lambda x,y:x*y,range(1,2))
'''

120
24
6
2
1
'''

>print map(lambda a:reduce(lambda x,y:x*y,range(1,a+1)),range(1,6))
[1, 2, 6, 24, 120]

>print reduce(lambda m,n:m+n,map(lambda a:reduce(lambda x,y:x*y,range(1,a+1)),range(1,6)))
153

>filter(lambda N:len(filter(lambda M:N%M==0,range(2,int(N**0.5)+1)))==0,range(100,201))