Python's meta-class ORM

What is a meta-class
In Python everything is object, the class is an object, the instance object is created by the class, and the class is created by the Meta class. In short, the class used to create the class is called a meta-class (Metaclass). The function type is actually a meta-class, and type is the meta-class that Python uses to create all the classes behind it.

The role of Globals ()
The Globals () function returns a dictionary that holds all global variables for all current positions.

Type () dynamically create class
Type (' Class name ', (parent class,), {attribute})

What is ORM?
ORM is the object relational Mapping, the full name of a relational mapping. To simplify SQL operations, encapsulate the operations of a database into a class, map a table to a class, map a field to a property, and map a row to an instance. With such a mapping of one by one, we can avoid directly manipulating the database, as long as the appropriate method is called.
Usage of 5.setattr () and GetAttr ()
SetAttr (Object, property, property value) to set a value for an attribute in an object
GetAttr (Object, property [, Default]) reads the value of the property from the object, you can set the default value, or read the default value if it does not exist.
6. Built-in Modules
Builtin in Python2
Builtins in Python3

Python's meta-class ORM