for in sequence problem... possible new operator to add to py thon

[sismex01 at hebmex.com]

> From: Peter Hansen [mailto:peter at engcorp.com] 
> Sent: Jueves, 10 de Julio de 2003 11:36 a.m.
> 
> Adam Gent wrote:
> > [..snippage..]
> 
> [..more.snippage..]
>
> When you iterate over a dict in recent versions of Python, you 
> are by definition iterating over the keys in the dict.  If you
> want the values, you use .values(), and if you want both keys
> and values, you use .items().  See the docs for more.
> 
> -Peter
>

Actually, .keys(), .values() and .items() return their respective
lists, in arbitrary order.

If you wish to use an iterator, use .iterkeys() , .itervalues()
or .iteritems() ; very helpful in the case of big dictionaries,
since you don't need to create and then destroy big lists.

Adam: If you wish to iterate through the items by default,
have you tried something like this?

class NewDict(dict):
    def __iter__(self):
        return super(NewDict,self).itervalues()

That should, by default (like "for x in nd:") iterate through
the values of a dictionary, instead of it's keys.

I haven't tested it though, so caveat emptor.

-gustavo
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