A simple code to learn meta class.

meta.py

#!/usr/bin/env python

class Meta(type):
    def __new__(self, name, bases, attrs):
        print('Meta: __new__: {} | {} | {} | {}'.format(self, name, bases, attrs))
        return super(Meta, self).__new__(self, name, bases, attrs)

    def __init__(cls, name, bases, attrs):
        print('Meta: __init__: {} | {} | {} | {}'.format(cls, name, bases, attrs))
        super(Meta, cls).__init__(name, bases, attrs)

    def __call__(cls, *args, **kwargs):
        print('Meta: __call__: {}'.format(cls))
        return super(Meta, cls).__call__(*args, **kwargs)

class Tmp(object):
    __metaclass__ = Meta

    def __new__(cls, *args, **kwargs):
        print('Tmp: __new__: {} | {} | {}'.format(cls, args, kwargs))
        return super(Tmp, cls).__new__(cls, args, **kwargs)

    def __init__(self, *args, **kwargs):
        print('Tmp: __init__: {} | {} | {}'.format(self, args, kwargs))
        super(Tmp, self).__init__(*args, **kwargs)

    def __call__(self, *args, **kwargs):
        print('Tmp: __call__: {} | {} | {}'.format(self, args, kwargs))
        super(Tmp, self).__call__(*args, **kwargs)