* Pyupgrade to Python 3.9 * updating DIRECTORY.md Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
* Create molecular_chemistry.py * round up outputs * Remove floating point * Add Wikipedia references * fixup! Format Python code with psf/black push * Add Conversions/Molecular Chemistry * updating DIRECTORY.md * Update molecular_chemistry.py Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: Christian Clauss <cclauss@me.com>