Metaclass Programming in Python: -- Pushing Object Oriented Programming to the Next Level --

Metaclass Programming in Python: -- Pushing Object Oriented Programming to the Next Level 

Metaclass configuration at runtime (python)

% cat dump.py
#!/usr/bin/python
import sys
if len(sys.argv) > 2:
    module, metaklass  = sys.argv[1:3]
    m = __import__(module, globals(), locals(), [metaklass])
    __metaclass__ = getattr(m, metaklass)

class Data:
    def __init__(self):
        self.num = 38
        self.lst = ['a','b','c']
        self.str = 'spam'
    dumps   = lambda self: `self`
    __str__ = lambda self: self.dumps()

data = Data()
print data