python中的列表

#list

m = [[1,2,3],[4,5,6],[7,8,9]]

subM = [row[1] for row in m];

print subM

print [row[1] + 1 for row in m]

print [row[1] + 1 for row in m if row[1]%2==0]

 

print [m[i][i] for i in [0,1,2] ]