to sum up
Data type in python: Integer / Boolean / string / tuple / list / dictionary / collection
Note: lists, dictionaries, collections can not be used as a dictionary key, it can not be used as elements in the collection
type of data:
(1) integer
(2) Boolean: only two values: True and Flase
(3) the string
Unique features: upper / lower / isdigit / strip / split / replace / encode / format / join
Public functions: len / index / slice / step / for / delete / modify
(4) tuple
Unique Features: None
Public functions: len / index / slice / step / for / delete [None] / [No] modification
(5) List
Unique features: upper / lower / isdigit / strip / split / replace / encode / format / join
Public functions: len / index / slice / step / for / delete / modify
(6) dictionary
Features: disordered
Unique features: keys / values / items / get / pop / update
Public functions: len / index / slice [no] / [No] step / for / delete / modify
(7) collection
Features: disordered and does not repeat
独有功能：add/pop/update/intersection/union/difference/symmetric_difference
Public functions: len / index [no] / section [no] / [No] step / for / delete [None] / [No] modification