[docs] [issue12600] Add example of using load_tests to parameterise Test Cases

[Robert Collins]

Robert Collins added the comment:

BTW I'm very happy with testscenarios (on pypi) for this, modulo one small issue which is the use of __str__ by the stdlib [which isn't easily overridable - there is a separate issue on that]. I'd be delighted to have testscenarios be in the stdlib, if thats desirable.

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nosy: +rbcollins

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<http://bugs.python.org/issue12600>
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