Message 77182 - Python tracker

Since cmp() was documented as removed in whatsnew3.0, it may be fair
game to complete the removal, treating it as a bugfix.  

If as Georg suggests it is done *very* quickly in 3.0.1 (say in the next
week or so), it is likely harmless and better than living with a
half-removed feature for the next three years.  Also, Georg intimated,
we will likely need to do 3.0.1 almost immediately anyway (the current
state of affairs with IO borders on the unusable.