the list

[<__main__.Number instance at 0x8114bb4>, <__main__.Number instance at 0x81044e4>, <__main__.String instance at 0x8146b14>, <__main__.Tuple instance at 0x81470d4>, <__main__.String instance at 0x810e86c>]

traversing the list

NUM(10)
NUM(999)
STRING(hello)
TUPLE(3,4)
STRING(End)

instantiating Object

Traceback (most recent call last):
  File "polymorph.py", line 47, in ?
    o=Object()
  File "polymorph.py", line 3, in __init__
    raise Exception, "attempting to instantiate ABSTRACT base class"
Exception: attempting to instantiate ABSTRACT base class