Sequence Operations

Because they are sequences, lists support all the sequence operations we discussed for strings; the only difference is that the results are usually lists instead of strings. For instance, given a three-item list:

>>> L = [123, 'spam', 1.23]          # A list of three different-type objects
>>> len(L)                           # Number of items in the list
3

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we can index, slice, and so on, just as for strings:

>>> L[0]                             # Indexing by position
123

>>> L[:-1]                           # Slicing a list returns a new list
[123, 'spam']

>>> L + [4, 5, 6]                    # Concatenation makes a new list too
[123, 'spam', 1.23, 4, 5, 6]

>>> L                                # We're not changing the original list
[123, 'spam', 1.23]