Python语法速查：系统交互
Exit, Print, Input, Command_Line_Arguments, Open, Path, OS_Commands.
Python语法速查：常用语法
Args, Inline, Import, Decorator, Class, Duck_Types, Enum, Exception.
Python语法速查：常用数据类型
Type, String, Regular_Exp, Format, Numbers, Combinatorics, Datetime.
Python语法速查：数据类型
List, Dictionary, Set, Tuple, Range, Enumerate, Iterator, Generator.
