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If you are working from a matrix and want (column) vectors, you can do:
a=matrix([[1,2,3,4],[5,6,7,8],[9,10,11,12]])
v0=a[:,0]
v0
If your data is in a list, you can use list comprehensions in python.
a=[[1,2,3,4],[5,6,7,8],[9,10,11,12]]
v1=[row[0] for row in a]
v1
You can do it all at once with:
a1=[[r[i] for r in a] for i in range(len(a))]
a1
