FM / metaclasses

/usr/lib64/python2.7/Demo/metaclasses

Name	Size	Mode	Actions
Eiffel.py	3468	0644	edit dl rm
Eiffel.pyc	4632	0644	edit dl rm
Eiffel.pyo	4530	0644	edit dl rm
Enum.py	4419	0644	edit dl rm
Enum.pyc	6179	0644	edit dl rm
Enum.pyo	6179	0644	edit dl rm
index.html	20573	0644	edit dl rm
meta-vladimir.txt	11527	0644	edit dl rm
Meta.py	2933	0644	edit dl rm
Meta.pyc	4579	0644	edit dl rm
Meta.pyo	4579	0644	edit dl rm
Simple.py	1192	0644	edit dl rm
Simple.pyc	2746	0644	edit dl rm
Simple.pyo	2746	0644	edit dl rm
Synch.py	7938	0644	edit dl rm
Synch.pyc	8462	0644	edit dl rm
Synch.pyo	8314	0644	edit dl rm
Trace.py	4133	0644	edit dl rm
Trace.pyc	6173	0644	edit dl rm
Trace.pyo	6173	0644	edit dl rm

Edit: /usr/lib64/python2.7/Demo/metaclasses/Simple.py (1192B)

import types

class Tracing:
    def __init__(self, name, bases, namespace):
        """Create a new class."""
        self.__name__ = name
        self.__bases__ = bases
        self.__namespace__ = namespace
    def __call__(self):
        """Create a new instance."""
        return Instance(self)

class Instance:
    def __init__(self, klass):
        self.__klass__ = klass
    def __getattr__(self, name):
        try:
            value = self.__klass__.__namespace__[name]
        except KeyError:
            raise AttributeError, name
        if type(value) is not types.FunctionType:
            return value
        return BoundMethod(value, self)

class BoundMethod:
    def __init__(self, function, instance):
        self.function = function
        self.instance = instance
    def __call__(self, *args):
        print "calling", self.function, "for", self.instance, "with", args
        return apply(self.function, (self.instance,) + args)

Trace = Tracing('Trace', (), {})

class MyTracedClass(Trace):
    def method1(self, a):
        self.a = a
    def method2(self):
        return self.a

aninstance = MyTracedClass()

aninstance.method1(10)

print aninstance.method2()

import types class Tracing: def __init__(self, name, bases, namespace): """Create a new class.""" self.__name__ = name self.__bases__ = bases self.__namespace__ = namespace def __call__(self): """Create a new instance.""" return Instance(self) class Instance: def __init__(self, klass): self.__klass__ = klass def __getattr__(self, name): try: value = self.__klass__.__namespace__[name] except KeyError: raise AttributeError, name if type(value) is not types.FunctionType: return value return BoundMethod(value, self) class BoundMethod: def __init__(self, function, instance): self.function = function self.instance = instance def __call__(self, *args): print "calling", self.function, "for", self.instance, "with", args return apply(self.function, (self.instance,) + args) Trace = Tracing('Trace', (), {}) class MyTracedClass(Trace): def method1(self, a): self.a = a def method2(self): return self.a aninstance = MyTracedClass() aninstance.method1(10) print aninstance.method2()