A sequence is an ordered, indexable collection of items.
All sequence types support a common set of operations that include in/not in, min()/max(), <sequence>.index, <sequence>.count() and <sequence>.len().
lists support additional mutable operations such as [slice assignment][], .append(), .extend(), .reverse(), and .copy().
All sequences can be indexed into using <sequence>[<index number>], copied in whole or in part using <sequence>[<start_index>:<stop_index>:<step>](_a full copy can be made with <sequence>[:]), and iterated over using the for item in <sequence> construct.
for index, item in enumerate(<sequence>) can be used when both the element index and the element value are needed.
Pythons list, tuple, str, byte, and range types all belong to this wider sequence type.
In the case of str, the “collection” is made up of unicode code points.
In the case of byte, bytes.
Ranges are “collections” of numbers conforming to a start:stop:step rule.