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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
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]
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