Summary:
Fix read/write in binary format, which crashes Python 3.
Additionally, clean up redundant (as for Python 3) code and
fix a handful of flake8 warnings.
Differential Revision: https://reviews.llvm.org/D79932
Using from __future__ import print_function it is possible to have a compatible behavior of `print(...)` across Python version.
Differential Revision: https://reviews.llvm.org/D55213
llvm-svn: 349454