[issue15767] add ImportNotFoundError

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

On Feb 19, 2013, at 07:49 PM, Brett Cannon wrote:

>Serihy & Barry: no. We do that now and it's already a nasty little hack. It
>would be better to let people catch an exception signaling that an import
>didn't happen because some module is missing than require introspection on a
>caught ImportError to tell what is going on (there's a reason why Antoine
>went to all of that trouble to add new exceptions so we don't have to look at
>the errno attribute on OSError). Exceptions are structured to work off of
>inheritance hierarchies (says the man who co-wrote the PEP to make all PEPs
>inherit from BaseException).

The difference being that checking errno on OSError/IOError is essentially
required to do anything useful with it, while this one seems like a rare
corner case (we've been doing pretty well without it so far).

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<http://bugs.python.org/issue15767>
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