[docs] [issue28612] str.translate needs a mapping example

[Chris Barker]

Chris Barker added the comment:

Agreed:

the custom dict type would be nice for a recipe or blog post or...

but not for the docs.

I'll note that the other trick to this recipe is that you need to know to use lambda to make a "None factory" for defaultdict -- though maybe that's a ToDo for the defaultdict docs...

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nosy: +ChrisBarker

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