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.
Python lists are mutable sequences. They are very similar to tuples, but they don't have the restrictions of immutability. Lists are commonly used to storing collections of homogeneous objects, but there is nothing preventing you from 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 separated [1, 2, 3] >>> [x + 5 for x in [2, 3, 4]] # Python is magic [7, 8, 9] >>> list((1, 3, 5, 7, 9)) # list from a tuple [1, 3, 5, 7, 9] >>> list('hello') # list from a string ['h', ...