[Python-Dev] Fix import errors to have data

[Guido van Rossum]

> It's going to be difficult to ensure that nothing ever gets a
> reference to a broken module, because of circular imports.  Suppose A
> imports B, which imports A. If A's initialisation subsequently fails,
> then even if A is removed from sys.modules, B still contains a
> reference to the broken A.

Yeah, but I don't mind; my patch is still a big improvement in other
cases and doesn't really make things any worse in the above case (B
has a reference to a broken A, just like without my patch).

Did anybody look at my patch?  Shall I check it in?

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