[Python-Dev] Negative indices in UserString.MutableString

Aahz aahz at pythoncraft.com
Thu Feb 17 23:23:36 CET 2005

On Thu, Feb 17, 2005, Walter D?rwald wrote:
> Currently UserString.MutableString does not support negative indices:
> >>> import UserString
> >>> UserString.MutableString("foo")[-1] = "bar"
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "/home/Python-test/dist/src/Lib/UserString.py", line 149, in __setitem__
>     if index < 0 or index >= len(self.data): raise IndexError
> IndexError
> Should this be fixed so that negative value are treated as being
> relative to the end?

Yup!  As usual, patches welcome.  (Yes, I'm comfortable channeling Guido
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"The joy of coding Python should be in seeing short, concise, readable
classes that express a lot of action in a small amount of clear code -- 
not in reams of trivial code that bores the reader to death."  --GvR

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