[issue15767] add ModuleNotFoundError

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

On Jul 02, 2013, at 07:16 AM, Serhiy Storchaka wrote:

>If most user code should catch a ModuleNotFoundError exception, perhaps it
>will be better rename old ImportError to ImportlibError (or ImportingError,
>or ImportMachineryError, or BaseImportError) and new ModuleNotFoundError to
>ImportError. This will left most existing user code untouched.

I urge some caution here.  I don't know that the above will cause problems,
but I do think you're walking into PEP territory.  I would feel much more
comfortable with an analysis based on testing existing third party code.

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