[issue21159] configparser.InterpolationMissingOptionError is not very intuitive

[Robert Collins]

Robert Collins added the comment:

I think we should close this again: if you subclass something you need to implement the full public API. raw has been in that API since 2010!.

It's a shame that folk have been implementing just-enough, rather than the actual API, but I don't see that has all that much bearing on the go-forward.

Rolling it back out of 3.4 could be done - but since the problematic subclasses are fixing themselves now 3.5 is out, that should take care of issues on 3.4 too.

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<http://bugs.python.org/issue21159>
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