[Python-Dev] Fix import errors to have data

[Guido van Rossum]

> Another possibility could be to add a ChainedImportError (or
> SubImportError?) which would derive from ImportError.  The module
> which imports a broken module would get the normal ImportError.  If
> the module doesn't catch the exception, it would get converted to this
> new type of ImportError.
> 
> I don't know how easy this would be to implement, but I think it
> would solve Jim's problem and perhaps be easier to deal with?

Having had the recent opportunity to root around in Java code that
chains exceptions like this a lot, I think I'm against that approach.

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