* #9943 : Adding coverage test for basic_graphs.py
* #9943 : Adding coverage test for basic_graphs.py
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Solve problem of line too long
* Improving coverage for matrix_exponentiation.py
* fix more than one file
* Update matrix_exponentiation.py
* Update matrix_exponentiation.py
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Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
* Tighten up psf/black and flake8
* Fix some tests
* Fix some E741
* Fix some E741
* updating DIRECTORY.md
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