Build failure due to python syntax error

[NAThompson]

Beginning in this build, we have a build failure:

Checking formatting for commit range: 937ff001ffa2 6e3d1b3fb0dc

./source/utils/bp4dbg/bp4dbg.py:40: [E999] SyntaxError: invalid syntax

./source/utils/bp4dbg/adios2/bp4dbg/metadata.py:141: [E999] SyntaxError: invalid syntax

./source/utils/bp4dbg/adios2/bp4dbg/data.py:126: [E999] SyntaxError: invalid syntax

The command "${TRAVIS_BUILD_DIR}/scripts/travis/run.sh" exited with 1.

Some low-effort triaging suggests that this might be the issue.

[NAThompson]

Ok, I can now explicitly reproduce:

$ pip2 install flake8
$ flake8 bp4dbg/bp4dbg.py
bp4dbg/bp4dbg.py:8:1: E302 expected 2 blank lines, found 1
bp4dbg/bp4dbg.py:40:68: E999 SyntaxError: invalid syntax

However, we see that the first line of bp4dbg.py explicitly reads

#!/usr/bin/env python3

So the problem has been caused by running a python2 linter on python3 code.

There are two options: Either drop the requirement of using python3 in these files, and go through and slap the from __future__ import print_function all over, or use the Python3 linter on python3 code. The fix in #2379 takes the latter approach.