[Python-Dev] Should KeyError use repr() on its argument?

[Guido van Rossum]

(SF bug 598451.)

The KeyError exception doesn't apply repr() to its argument.  That's
annoying in cases like this:

  >>> a = {}
  >>> a['']
  Traceback (most recent call last):
    File "<stdin>", line 1, in ?
  KeyError
  >>> 

Should this be fixed?  How?  (I guess we could add a KeyError__str__
method to exceptions.c that applies repr().)

I've got a feeling this is a feature, but not a very useful one.

--Guido van Rossum (home page: http://www.python.org/~guido/)