Fix C408 Errors in core/strings, core/arrays, core/dtypes...
...core/computation, core/indexes, core/ops, io/pytables.py, tests/dtypes, tests/io/generate_legacy_storage_files.py, tests/frame/methods/test_to_records.py, tests/groupby/transform/test_transform.py

- [X] xref #[38138](https://github.com/pandas-dev/pandas/issues/38138)
- [X] tests added / passed
- [X] passes `black pandas`
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Hello @austiezr! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:





































There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2020-12-02 19:55:09 UTC need to merge master. closing as these have already been done, sorry about that