8.1. Nested List of Lists
Also known as multidimensional lists or matrix
Examples:
>>> matrix = [[1, 2, 3],
... [4, 5, 6],
... [7, 8, 9]]
8.1.1. Format
Readability differs depending on whitespaces
>>> a = [[1,2,3],[4,5,6],[7,8,9]]
>>> b = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> c = [[1,2,3], [4,5,6], [7,8,9]]
>>> d = [
... [1, 2, 3],
... [4, 5, 6],
... [7, 8, 9],
... ]
>>> e = [
... [1, 2, 3],
... [4, 5, 6],
... [7, 8, 9]]
>>> f = [[1, 2, 3],
... [4, 5, 6],
... [7, 8, 9],
... ]
>>> g = [[1, 2, 3],
... [4, 5, 6],
... [7, 8, 9]]
8.1.2. Length
>>> data = [[1, 2, 3],
... [4, 5, 6],
... [7, 8, 9]]
>>> len(data)
3
>>> len(data[0])
3