Python: Journey from Novice to Expert

Mutable sequences

Mutable sequences differ from their immutable sisters in that they can be changed after creation. There are two mutable sequence types in Python: lists and byte arrays. I said before that the dictionary is the king of data structures in Python. I guess this makes the list its rightful queen.

Lists

Python lists are mutable sequences. They are very similar to tuples, but they don't have the restrictions due to immutability. Lists are commonly used to store collections of homogeneous objects, but there is nothing preventing you to store heterogeneous collections as well. Lists can be created in many different ways, let's see an example:

>>> []  # empty list
[]
>>> list()  # same as []
[]
>>> [1, 2, 3] # as with tuples, items are comma ...