v4: Drop support for EOL Python 2.6 and 3.0-3.3 #626
Merged
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This a version of #617 applied to the
v4
branch.Checklist
Short description of what this PR does:
Python 2.6 and 3.0-3.3 are EOL and no longer receiving security updates (or any updates) from the core Python team.
They're also little used.
Here's the pip installs for sendgrid from PyPI for September 2018:
Source:
pypinfo --start-date 2018-09-01 --end-date 2018-09-30 --percent --markdown sendgrid pyversion
I see #352 (comment) notes support for 2.6 is planned to be dropped in the next SDK version, and I don't think 3.0-3.2 were supported anyway.
This PR also upgrades code to use newer Python syntax, removes some old compatibility code, and fixes some flake8 and inspection warnings.