[issue23641] Got rid of bad dunder names

[Martin Panter]

Martin Panter added the comment:

I’m not very familiar with the mock module so can't comment if removing div is sensible there. But all the other changes seem reasonable. I just left a few suggestions for further tweaks on Rietveld.

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nosy: +vadmium

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<http://bugs.python.org/issue23641>
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