[docs] [issue10533] Need example of using __missing__

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

Well, I was perfectly aware of __missing__ - it's just a three liner to do it when using a lambda isn't *that* bad... I'm sure the documentation could be improved to highlight __missing__ though. It's almost always the case that documentation can be improved. :-)

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<http://bugs.python.org/issue10533>
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