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change doctest line (#2007)

* change doctest line

import doctest is not relevant with algorithms. move it under main section.

* from doctest import testmod

Co-authored-by: Christian Clauss <cclauss@me.com>
J
Jie Han committed
7a8696cd6d5611a7e2f929ca13f54e684126b6f2
Parent: f9e0dd9
Committed by GitHub <noreply@github.com> on 5/18/2020, 7:44:27 PM