Hi guys,
I've got the following (not working) code:
class Attribute(object):
def __init__(self, attribute_name, att_type_name):
self._attribute_name = attribute_name
try:
self._attribute_type = globals()[att_type_name]
except KeyError:
self._attribute_type = getattr(globals()["__builtins__"],
att_type_name)
def __get__(self, obj, obj_type):
return getattr(obj, self._attribute_name)
def __set__(self, obj, value):
if isinstance(value, self._attribute_type):
setattr(obj, self._attribute_name, value)
else:
raise ItemTypeException(self._attribute_type, type(value))
class BaseItem(object):
ident = Attribute("ident", "int")
owner = Attribute("owner", "str")
item = Attribute("item", "BaseItem")
if __name__ == "__main__":
print "About to create an item"
test = BaseItem()
print "OK"
The problem is that the descriptors are created when the module is
evaluated. But at this time the class BaseItem is not known yet. Any ideas?
Cheers,
Jan
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