>>> arow
[0, 0]
>>> table= arow * 4
>>> table
[0, 0, 0, 0, 0, 0, 0, 0]
>>> table = [arow] * 4
>>> table
[[0, 0], [0, 0], [0, 0], [0, 0]]
>>> t = [[0]*2]*4
>>> t
[[0, 0], [0, 0], [0, 0], [0, 0]]
>>> def init(matrix):
    for row in range(len(matrix)):
            for col in range(len(matrix[row])):
                       matrix[row][col] = row*10 + col
                                        print matrix


>>> t
[[0, 0], [0, 0], [0, 0], [0, 0]]
>>> init(t)
[[30, 31], [30, 31], [30, 31], [30, 31]]
>>> t
[[30, 31], [30, 31], [30, 31], [30, 31]]
>>> table
[[0, 0], [0, 0], [0, 0], [0, 0]]
>>> init(table)
[[30, 31], [30, 31], [30, 31], [30, 31]]
>>> arow
[30, 31]
>>> arow[0] = 0
>>> arow[1] = 0
>>> arow
[0, 0]
>>> table= [arow[:] ] * 4
>>> table
[[0, 0], [0, 0], [0, 0], [0, 0]]
>>> init(table)
[[30, 31], [30, 31], [30, 31], [30, 31]]
>>> table = []
>>> for i in range(4):
    table.append(arow[:])


>>> table
[[0, 0], [0, 0], [0, 0], [0, 0]]
>>> init(table)
[[0, 1], [10, 11], [20, 21], [30, 31]]
>>>