Python identifiers
In python, the identifier is made up of letters, numbers or underlines.
In python, all identifiers can include letters, numbers, and the underscore (_), but can not start with a number.
python identifier is case sensitive.
Starts with an underscore identifiers is of special significance. It begins with a single underscore _foo class representatives can not directly access the property, to be accessed through an interface class.
In the private members of class representatives __foo beginning double underlined, double underlined to __foo__ Representative python in particular beginning and end of specific identification method, such as __init __ () representative of the class constructor.
python can show the same row multiple statements, method is to use a semicolon; separated
__a private variables
Can not be inherited; you can call in the class, not invoked externally.
When the variable is particularly important with an underscore to indicate private
E.g:
@property accessor and modifier @ XXX.setter
E.g:
In python, dynamic class
E.g:
__slots__ magic variables
