[issue38771] Bug in example of collections.ChainMap

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

The example was just meant to be a quick snippet to suggest a possible use case.  It isn't a stand-alone application.  However, stylistically, this is an improvement and I'll accept some variation of the PR.

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priority: normal -> low
versions:  -Python 3.5, Python 3.6, Python 3.7

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<https://bugs.python.org/issue38771>
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