>>> x = (520,)
>>> x
(520,)
>>> type(x)
<class 'tuple'>
>>> y = (520)
>>> y
520
>>> type(y)
<class 'int'>
>>> t = (123, "FishC", 3.14)
>>> x, y, z = t
>>> x
123
>>> y
'FishC'
>>> z
3.14
>>> s = [1, 2, 3]
>>> t = [4, 5, 6]
>>> w = (s, t)
>>> w
([1, 2, 3], [4, 5, 6])
>>> w[0][0] = 0
>>> w
([0, 2, 3], [4, 5, 6])