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Update tests.py

changing tests.py according to changes in lib.py
and replaced A.__str__() with str(A)
A
Ashwek Swamy committed
93e096f0c13276e313f7ce5c937a72217dbfe396
Parent: b2b34e2
Committed by GitHub <noreply@github.com> on 11/12/2018, 6:04:31 PM