Du Yuanchao 34294b5641 Update sum_of_digits.py (#2319) ...

* * support negative number
* add different version

* fixup! Format Python code with psf/black push

* sum(int(c) for c in str(abs(n)))

* updating DIRECTORY.md

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

2020-08-16 20:31:06 +02:00

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