More miscellaneous fixes for Python3 compatibility.

This patch fixes a bunch of stuff flake8 revealed (thanks to
cclauss@bluewin.ch for the tip!) and a few dangling print
statements (thanks to Ola.Eklundh@qlik.com for the tip!).

Bug: gyp:36
Change-Id: Ie24cdda2613c7d76bf06875f9de435e001a3e8b6
Reviewed-on: https://chromium-review.googlesource.com/c/1368752
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>