travis-CI tests breaking on Python 2

[tyarkoni]

As of a few days ago, tests are breaking for all Python 2 builds on Travis-CI. This must reflect some recent change in the Py2 environment, as re-running tests that previously passed on old builds under Python 2 also now results in failure. Conda hasn't updated Python 2 itself in a while (current version has been 2.7.15 for a while) so it's probably an update to some other library that's causing the problem, but I can't reproduce the issue locally.

[effigies]

Pinning numpy < 1.16 for Python 2 has fixed our tests in nipype.

[tyarkoni]

Thanks, will try that!

[effigies]

See nipy/nipype#2855.

Not that I recommend releasing with such a pin, but it may help narrow down the issues. Or possibly it's a numpy bug that needs to be reported upstream.

[tyarkoni]

Doesn't look like that solved the problem... will investigate further later this week. Thanks anyway!

[effigies]

Also unable to reproduce locally. Re-running tests on the latest commit on master: https://travis-ci.org/bids-standard/pybids/builds/478538925