* Tighten up psf/black and flake8
* Fix some tests
* Fix some E741
* Fix some E741
* updating DIRECTORY.md
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* Created Sherman Morrison
* Added docstring for class
* Updated Sherman morrison
1. Added docstring tests
2. Tweaked __str__() using join
3. Added __repr__()
4. Changed index validation to be independent method
* Applied cclauss's point
1. Reduced line length for __str__()
2. Removed parens for assert