Just for curiosity: does python use a mark-and-sweep garbage collector or simple reference counting? In the latter case it would not garbage collect circular references, right ?
For mark-and-sweep, I assume there must be a toplevel Object from which all other objects can be accessed or they will be GCed (called "Smalltalk" in Smalltalk). Is there such a thing? -- http://mail.python.org/mailman/listinfo/python-list
