To inherit from an immutable class, like string or tuple, you need to use the __new__ member, not __init__. See, e.g.:
http://www.python.org/2.2.3/descrintro.html#__new__ -- http://mail.python.org/mailman/listinfo/python-list
To inherit from an immutable class, like string or tuple, you need to use the __new__ member, not __init__. See, e.g.:
http://www.python.org/2.2.3/descrintro.html#__new__ -- http://mail.python.org/mailman/listinfo/python-list