BLD: wheel building failing for install issue

[jreback]

https://travis-ci.org/MacPython/pandas-wheels/jobs/539541488
https://travis-ci.org/MacPython/pandas-wheels/builds/539541484 (the builds)

just started failing

cc @pandas-dev/pandas-core

[TomAugspurger]

New cryptography release

old:

Collecting cryptography>=2.3.0 (from moto)
  Downloading https://files.pythonhosted.org/packages/93/1a/69ddcb02759b4e196ab3785315fc87ec6246427effd360bcb373206842ea/cryptography-2.6.1-cp34-abi3-manylinux1_i686.whl (2.1MB)

new:

Collecting cryptography>=2.3.0 (from moto)
  Downloading https://files.pythonhosted.org/packages/c2/95/f43d02315f4ec074219c6e3124a87eba1d2d12196c2767fadfdc07a83884/cryptography-2.7.tar.gz (495kB)

Seems like there are manylinux wheels for 2.7, and 3.4 but not 3.6 (failing build). https://pypi.org/project/cryptography/2.7/#files

Aside: do you get notifications for these failures @jreback?

[TomAugspurger]

Wait I'm confused now. The failing job is for python 3.6, but it seems like for cryptography 2.6.1 it downloaded the wheel with the -cp34-abi3-manylinux1... i.e. the wheel for CPython 3.4

Edit: from pyca/cryptography#4406 (comment)

cryptography ships an abi3 wheel for macOS and linux, which is compatible with 3.4+ (including 3.7) and doesn't need a 3.7 specific wheel. pip already handles this automatically

[TomAugspurger]

I restarted the build, to ensure that the wheels were actually present when we tried to fetch them. It did indeed fail.

When I create a linux py36 environment locally, and pip install cryptography, I do get the cryptography-2.7-cp34-abi3-manylinux1 wheel.

[TomAugspurger]

Ah the difference is probably the platform. That build is 32-bit.

https://cryptography.io/en/latest/changelog/

BACKWARDS INCOMPATIBLE: We no longer distribute 32-bit manylinux1 wheels. Continuing to produce them was a maintenance burden.

So for now let's include --binary-only=cryptography for this.

[jreback]

yes i get notification from pandas-wheels on failures

not sure how though