Fix syntax for flake8 passing (#2096)

* Fix syntax for flake8 passing

* fixup! Format Python code with psf/black push

* # fmt: off / # fmt: on

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>

strings/z_function.py

@@ -86,4 +86,5 @@ def find_pattern(pattern: str, input_str: str) -> int:
 
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()