8.1. Nested List of Lists

Important

• 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

8.1.3. Assignments