class Property(object):
_obj = []
class __metaclass__(type):
def __get__(cls, obj, objtype=None):
if obj is not None:
cls._obj.append( obj )
return cls
@staticmethod
def parent_instancemethod(func):
"""
decorator makes the decorated Property method behave like
the Property's parent's instance method
"""
@classmethod
def _parent_instancemethod(cls, *args, **kwds):
return func(cls._obj.pop(), *args, **kwds)
return _parent_instancemethod
@staticmethod
def parent_classmethod(func):
"""
decorator makes the decorated Property method behave like
the Property's parent's class method
"""
@classmethod
def _parent_classmethod(cls, *args, **kwds):
return func(cls._obj.pop().__class__, *args, **kwds)
return _parent_classmethod
# Testing
if __name__ == "__main__":
class A:
a = 10
def method1(self, *args, **kwds):
print "-------------------------"
print "In A.method1()"
print " Object: ", self
print " Arguements: ", args, kwds
print "-------------------------"
@classmethod
def method2(cls, *args, **kwds):
print "-------------------------"
print "In A.method2()"
print " Class: ", cls
print " Arguements: ", args, kwds
print "-------------------------"
@staticmethod
def method3(*args, **kwds):
print "-------------------------"
print "In A.method3()"
print " Arguements: ", args, kwds
print "-------------------------"
class B(Property):
a = 99
b = 'spam'
@Property.parent_instancemethod
def method1(self, *args, **kwds):
print "-------------------------"
print "In A.B.method1()", args, kwds
print " Object: ", self
print " Arguements: ", args, kwds
print "-------------------------"
@Property.parent_classmethod
def method2(cls, *args, **kwds):
print "-------------------------"
print "In A.B.method2()"
print " Class: ", cls
print " Arguements: ", args, kwds
print "-------------------------"
@classmethod
def method3(cls, *args, **kwds):
print "-------------------------"
print "In A.B.method3()"
print " Class: ", cls
print " Arguements: ", args, kwds
print "-------------------------"
@staticmethod
def method4(*args, **kwds):
print "-------------------------"
print "In A.B.method4()"
print " Arguements: ", args, kwds
print "-------------------------"
x = A()
print "x: ", x
print "x.a: ", x.a
print "x.B: ", x.B
x.method1(1, 2, 3)
x.method2(4, 5, 6)
x.method2(7, 8, 9)
print
print "x.B.a: ", x.B.a
print "x.B.b: ", x.B.b
x.B.method1('A', 'B', 'C')
x.B.method2('D', 'E', 'F')
x.B.method3('G', 'H', 'I')
x.B.method4('J', 'K', 'L')
