[issue28612] str.translate needs a mapping example

[Raymond Hettinger]

Raymond Hettinger added the comment:

I like the idea of adding a mapping example but don't want to encourage use of defaultdict in contexts like this one.  A defaultdict usefully specifies a default but has the unpleasant side-effect of altering the dictionary (adding new keys) during the look-up phase.  This has bitten a lot of people (including famous ones like Peter Norvig).

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nosy: +rhettinger

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<http://bugs.python.org/issue28612>
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