python中map()与zip()操作方法

a = ['1','2','3','4']
print map(list,a)
print map(int,a)

list = [[1,2,3],[4,5,6],[7,8,9]]
t = zip(*list)
print t

x = [1,2,3,4,5]
y = [6,7,8,9,10]
a = zip(x,y)
print a

[python] 
> list = [[0,1,2],[3,1,4]] 
> [sum(x) for x in list] 
[3, 8] 
> map(sum,list) 
[3, 8] 

[python] 
> list = [[0,1,2],[3,1,4]] 
> zip(*list) 
[(0, 3), (1, 1), (2, 4)] 
> [sum(x) for x in zip(*list)] 
[3, 2, 6] 
> map(sum,zip(*list)) 
[3, 2, 6] 

[python] 
> x=[1,2,3] 
> y=[4,5,6] 
> zipped = zip(x,y) 
> zipped 
[(1, 4), (2, 5), (3, 6)] 
> x2,y2=zip(*zipped) 
> x2 
(1, 2, 3) 
> y2 
(4, 5, 6) 
> x3,y3=map(list,zip(*zipped)) 
> x3 
[1, 2, 3] 
> y3 
[4, 5, 6]