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Antoine Pitrou authored and Wes McKinney committed 412145b8a73
ARROW-5757: [Python] Remove Python 2.7 support Part of the changes were done using [pyupgrade](https://github.com/asottile/pyupgrade). Closes #6410 from pitrou/ARROW-5757-py2-goodbye and squashes the following commits: f0f9f513b <Antoine Pitrou> Address review comments 561ac965c <Antoine Pitrou> ARROW-5757: Remove Python 2.7 support Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm+git@apache.org>