Python. Overview of combined data types

Overview of composite data types

The computer executes according to instructions , Not human will .
Computers are good at following instructions , but bot at reading your mind.

Sequence type ：
It's an element vector , There is a sequence of elements , Access... By serial number , Elements are not exclusive .
Collection types ：
It's a collection of elements , Disorder between elements , The same element exists only in the collection .
Mapping type ：
yes “ key - value ” Combination of data items , Each element is a key value pair , Expressed as （key,value）

Sequence types support membership operations (in)、 Length calculation function (len())、 Fragmentation ([ ]), The element itself can also be a sequence type .