Raymond Hettinger <[email protected]> added the comment:

The example is supposed to be a sketch of the overall pattern.  IMO, putting 
concrete and useless implementations of do_work() and source() make the example 
less intelligible.

Instead, we can add a note that the user needs to supply their own do_work() 
and source().

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nosy: +rhettinger

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<https://bugs.python.org/issue40387>
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