[Python-Dev] type categories

[Andrew Koenig]

David> Usually this goes to the same question we were discussing about
David> re-iterability detection. You want to fail early because it's
David> faster, but also because you don't want to mutate important
David> program state in some un-recoverable way in systems that are
David> actually supposed to recover from errors.

And also because it is usually much easier to explain what went
wrong if the failure is detected early.

-- 
Andrew Koenig, ark@research.att.com, http://www.research.att.com/info/ark