[issue28818] simplify lookdict functions

[INADA Naoki]

INADA Naoki added the comment:

http://bugs.python.org/issue28427#msg284101

> Sidenote: all branches now have a different version of dict object each, which makes maintenance really painful...

Large difference between py36 and py37 is this patch.
Can I backport this to py36 to ease maintenance?

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