Fix astar (#1966)

* Fix astar

Single character variable names are old school.

* fixup! Format Python code with psf/black push

* Tuple

* updating DIRECTORY.md

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

Christian Clauss committed 5y ago

a7cd633bb643cdeb38f83d89e921e3ac4dfe9623

Parent: 3d9bb05

Committed by GitHub <noreply@github.com> on 5/10/2020, 3:19:40 PM