tree e7e029404c7fd055d3ff60ac2d7c5874f3b9f80a
parent 14b2eeb009b55cc1eeb9b366db6d22edfc6ee183
author Logan Chien <loganchien@google.com> 1509525616 +0800
committer Logan Chien <loganchien@google.com> 1509705122 +0800

sourcedr: Cleanup Python import statements

This commit removes `from ... import *` statements, refines some
`from ... import ...` statements, and removes several unused imported
names.

Test: ./sourcedr/functional_tests.py
Test: ./sourcedr/preprocess.py
Change-Id: Iabdb8e062e3beebe0bcaffdb8703e84e1b9a0eee