CLN: resolve isort mypy import confilict test_transform
Part of #35134
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

@WillAyd I merged #35339 since you approved that. Are you OK with this and #35380 Sure looks good

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> On Jul 29, 2020, at 5:17 AM, Simon Hawkins <notifications@github.com> wrote:
> 
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> @WillAyd I merged #35339 since you approved that. Are you OK with this and #35380
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 Thanks @VirosaLi 