Matrix = [[0]*5 for i in range(5)]
Matrix[0][0] = 1
Matrix[4][0] = 5

>>> a = []
>>> a.append([])
>>> a[0].append(10)
>>> a[0].append(20)
>>> a.append([])
>>> a[1].append(500)
>>> a[1].append(600)
>>> a[1].append(700)
>>> a
[[10, 20], [500, 600, 700]]

a = ((10, 20), (30, 40), (50, 60))
b = ([10, 20], [30, 40], [50, 60])
c = [(10, 20), (30, 40), (50, 60)]