get rid of six.iterkeys #29077
Description
only 3 files are touched
Component: python3
Author: Frédéric Chapoton
Branch/Commit: 8d9ecb1
Reviewer: Travis Scrimshaw
Issue created by migration from https://trac.sagemath.org/ticket/29077
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only 3 files are touched
Component: python3
Author: Frédéric Chapoton
Branch/Commit: 8d9ecb1
Reviewer: Travis Scrimshaw
Issue created by migration from https://trac.sagemath.org/ticket/29077