deploy fails with pip 10.0.0

[dmulter]

I'm running a venv with Python 3.6.3 and just upgraded PIP from 9.0.3 to the 10.0.0 and get the following error for chalice deploy:

chalice.deploy.packager.PackageDownloadError: Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: module 'pip' has no attribute 'main'

I downgrade back to 9.0.3 and all works fine.

[dstufft]

There is a version pin for pip<10 in our setup.py, however we should update chalice to handle pip 10 and drop that pin.

[jamesls]

Yeah I ran into this myself. I wonder if it's worth having (assuming it's feasible) the range be >9,<11 or if we should just only support 10.x.

[dstufft]

It should be pretty easy to support both.

[dmulter]

FYI, the same thing is happening again when upgrading to the latest pip v18.0.

[ricky-sb]

Looks like the new pip version broke chalice again. Getting the same error.