bytecolor <[EMAIL PROTECTED]> wrote: ... > So how can I tell if an instance of point, line or circle has actually > been assigned to a variable?
You can't really distinguish whether an object has been assigned to a variable, an item in a list, an attribute, etc etc -- all of these assignments are much the same thing, there is nothing special about variables to distinguish them from the other kind of 'labels'. Indeed, for example, global variables are EXACTLY the same thing as attributes of a module objects which in turn are exactly the same things as values in the module's __dict__ -- so, any hopes of distinguishing between variables, attributes, and items inside a container, must clearly be abandoned. You can do various other things that might come close to what you want, such as using weak references in your list (if no 'true' reference exists, an object goes away and _weak_ references to that object let you check if the object is still around or has gone away) -- that will let you know whether the object has been assigned to *anything* (you can perform a similar task by checking on the number of references extant to an object). But checking if the existing references are indeed 'variables' or something else is a hard, unrewarding task. Alex -- http://mail.python.org/mailman/listinfo/python-list
