Fix DeprecationWarning related to collections.Mapping #371
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This warning got reported in alecthomas#367
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alecthomas
approved these changes
Dec 14, 2018
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This is a proposed fix for #367. The
collections.abcmodule got introduced in Python 3.3 so that's why it's done separately from the other Python 3 / Python 2 compatibility code above it.