| Dir : /lib64/python2.7/Demo/metaclasses/ |
| Server: Linux host100322.itwesthosting.com 3.10.0-1160.144.1.el7.tuxcare.els4.x86_64 #1 SMP Tue Apr 7 08:40:40 UTC 2026 x86_64 IP: 144.91.64.173 |
| Dir : //lib64/python2.7/Demo/metaclasses/Simple.py |
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()