def property(fget=None, fset=None, fdel=None, doc=None):
				
				    class Property(object):
				            "Emulate PyProperty_Type() in Objects/descrobject.c"
				    
				            def __init__(self, fget=None, fset=None, fdel=None, doc=None):
				                    self.fget = fget
				                    self.fset = fset
				                    self.fdel = fdel
				                    if doc is None and fget is not None:
				                            doc = fget.__doc__
				                    self.__doc__ = doc
				    
				            def __get__(self, obj, objtype=None):
				                    if obj is None:
				                            return self
				                    if self.fget is None:
				                            raise AttributeError("unreadable attribute")
				                    return self.fget(obj)
				    
				            def __set__(self, obj, value):
				                    if self.fset is None:
				                            raise AttributeError("can't set attribute")
				                    self.fset(obj, value)
				    
				            def __delete__(self, obj):
				                    if self.fdel is None:
				                            raise AttributeError("can't delete attribute")
				                    self.fdel(obj)
				    
				            def getter(self, fget):
				                    return type(self)(fget, self.fset, self.fdel, self.__doc__)
				    
				            def setter(self, fset):
				                    return type(self)(self.fget, fset, self.fdel, self.__doc__)
				    
				            def deleter(self, fdel):
				                    return type(self)(self.fget, self.fset, fdel, self.__doc__)
				
					return Property(fget,fset,fdel,doc)