How is overloading __getitem__ in subclasses of str supposed to work in Pythton 2.2b1 ?

[Andreas.Trawoeger]

Hi!

A new Python 2.2 Beta version and another: Is this a bug or am I dumb
question from myself (The last time I ran into the bug that overloading
__str__ didn't work).
Overloading __str__ does work fine in Python 2.2b1 (Thanks to Tim Peters
for that). So my next adventure seams to be the __getitem__ method.

The following short and simple implementation ends in an endless loop:

from binascii import b2a_hex

class octetstring(str):
    def __str__(self):
        return b2a_hex(self)
    def __getitem__(self,index):
     return b2a_hex(self[index])

o = octetstring('ABCD')
print "o   :",o
print "o[0]:",o[0]

Well this isn't a surprise because I'm using the [ ] method in __getitem__
which implements [ ].
But I have no clue how I could write an different implementation for
__getitem__.


cu andreas

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