On Fri, 07 Nov 2008 12:44:40 +0000, Nigel Rantor wrote:
> Yes, well, Perl has 'each' for iterating over pairs, so they look
> almost identical. The main difference I can see is that python
> defaults to assuming you want the keys of a hash when iterating
> rather than the values.

Perl also has 'each' for iterating over keys, and there's no default
- it's always explicit, though possibly a bit subtle:

  while(my($k,$v)=each %h){
    # Explicit iteration of pairs
  }

  while(my $k=each %h){
    # Explicit iteration of keys
  }

You could argue that making it robust in the face of false keys
reduces the subtlely somewhat, but the extra unwieldiness also
obscures the intent somewhat in my view:

  while(defined(my $k=each %h)){
  }

-- 
	Peter Haworth	pmh@edison.ioppublishing.com
"Unfortunately, in this case, ``obvious'' is synonymous with ``wrong''."
		-- Larry Wall in Apocalypse 3