join dictionaries using keys from one & values

[Erik Max Francis]

ProvoWallis wrote:

> I'm still learning python so this might be a crazy question but I
> thought I would ask anyway. Can anyone tell me if it is possible to
> join two dictionaries together to create a new dictionary using the
> keys from the old dictionaries?

There is no builtin method.  The usual way is to just wrap a class 
around two dictionaries, one for mapping keys to values and the other 
for mapping values back to keys.

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