[issue4247] Docs: Provide some examples of "pass" use in the tutorial.

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

I'd change the exceptions, replace comment with string.
Instead of

raise NotImplementedError  # Set up dummy log back-end

write

raise NotImplementedError('Set up dummy log back-end')

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nosy: +LambertDW

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<http://bugs.python.org/issue4247>
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