> str  is very much immutable.
> So you can't even set some custom attribute.

I found a way to cheat. =)

Python 2.6 has backported the Python 3000 bytearray() method, which is
basically just a mutable str.  No import statement needed.

http://www.python.org/dev/peps/pep-3112/

So you can copy your str into a bytearray, change it, then make it a
str again.

I can't believe I never ran into this before(!)  If it's in Python
3.X, it must be good. ;-)

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