how to select one column of a matrix?

[truerenwang]

Hi everybody, 

I have a question about how to select a column of a matrix in python.

For example:

matrix =[[1,4,3,2],

             [2,3,1,4],

             [4,1,2,3],

             [3,4,1,2]]

if I want to select the first row, I can just type

print matrix[0][:]

and it gives me [1,4,3,2]. But how can I get the first column [1,2,4,3]? I tried 

print matrix[:][0]

but it still gives me [1,4,3,2]