Reference

class metaframe.MetaFrame

This Metaclass intercepts instance creation/initialization enabling use cases like modification of args, kwargs and/or scanning of the object post init

_new_pre(*args, **kwargs)

Called before the object is created.

Params:

• cls: The class which is going to be instantiated
• args: To be passed to __new__ for class instantiation
• kwargs: To be passed to __new__ for class instantiation

Returns:as a tuple Return type:cls, args, kwargs

The return values need not be the same that were passed

_init_pre(obj, *args, **kwargs)

Called after object creation and before the object is init’ed

Params:

• cls: The class which has been instantiated
• obj: The class instance which has been created
• args: To be passed to __init__ for object initialization
• kwargs: To be passed to __init__ for object initialization

Returns:as a tuple Return type:obj, args, kwargs

The return values need not be the same that were passed

_init_post(obj, *args, **kwargs)

Called after object initialization

Params:

• cls: The class which has been instantiated
• obj: The class instance which has been created
• args: Which were passed to __init__ for object initialization
• kwargs: Which were passed to __init__ for object initialization

Returns:as a tuple Return type:obj, args, kwargs

The return values need not be the same that were passed. But modifying args and/or kwargs no longer plays a role because the object has already been created and initialized

__call__(*args, **kwargs)

Creates an initializes an instance of cls calling the pre-new, pre-init/post-init hooks with the passed/returned args / kwargs

class metaframe.MetaFrameBase

Enables inheritance without having to specify/declare a metaclass