[Edu-sig] Reversing dictionaries, closures, permutations etc.

[Guido van Rossum]

> How to reverse a dictionary?  The dict class has no .reverse() method, which
> makes sense, as keys must be immutable so there's no guarantee the reverse
> is even valid (throwing an exception would be the way to go in this case).

I believe this is usually called "inverse".  In Python, "reverse"
means reversing the order of the elements of a list,
e.g. lst.reverse() and in 2.4 the reversed() built-in.

--Guido van Rossum (home page: http://www.python.org/~guido/)