Logged In: YES 
user_id=89016

The subclass problem has been fixed in:
Python/bltinmodule.c 2.275
Lib/test/test_builtin.py 1.9

But now something strange happens:
---
class badstr(str):
···def __getitem__(self, index):
······return str.__getitem__(self, index).upper()

print filter(None, badstr("abc"))
print filter(lambda x: x, badstr("abc"))
---
This prints
---
abc
ABC
---
although according to the filter docstring they should be
the same.