why import plugins used exec instead of __import__?

[Robert Collins]

On Tue, 2008-06-17 at 08:41 +0300, Alexander Belchenko wrote:
> Ah, I found it. __import__ allows to import any file even with non-valid python name,
> while exec "import foo-bar" will produce Syntax Error.
> 
> Sorry for noise email.

Another difference is the amount of code. Using __import__ correctly
(making the plugin available as a module after it is loaded, handling
various errors, mapping the asked for module to the actual thing to
pass) is very complex. So using exec is much less code to duplicate from
the python standard library, and the result is less maintenance and
fewer things to go wrong.

-Rob
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