Reversing a dict?

[cokofreedom at gmail.com]

On May 6, 5:20 pm, krumbleb... at gmail.com wrote:
> Hi - further to my earlier query regarding partial matches (which with
> all your replies enabled me to advance my understanding, thanks), I
> now need to reverse a dict.
>
> I know how to reverse a list (with the reverse method - very handy),
> but it doesn't seem possible to reverse a dict.
>
> I suspect what I need to do is somehow go from:
>
> thelist=list(thedict)
> thelist.reverse()
> thedict=dict(thelist)
>
> Does anyone know how to convert / or reverse a dict?
>
> thanks
>
> kb.

Issue 1: A dictionary is not ordered so cannot be reversed, as is.

Saw something like this though:

info = {"PHP":"17th May",
       "Perl":"15th June",
       "Java":"7th June",
       "Python":"26th May",
       "Tcl":"12th July",
       "MySQL":"24th May"}

topics = info.keys()
topics.sort()
topics.reverse()

for topic in topics:
   print "Next",topic,"course starts",info[topic]