These represent finite ordered sets indexed by non-negative numbers. The built-in function `len()`

returns the number of items of a sequence. When the length of a sequence is `n`

, the index set contains the numbers `0, 1, ..., n-1`

. Item `i`

of sequence a is selected by `a<a href='https://docs.python.org/3/reference/datamodel.html#the-standard-type-hierarchy' target='_blank' rel='nofollow'>i]`

.

[Python Docs - Standard Type Hierarchy

## More

- Built-in sequence types are:
`list`

`tuple`

`range`

- Built-in sequence types are iterable types (implement required
`__iter__()`

method). - Operations: