coveralls is not working for python 3.5 or 3.8

[jmilloy]

The 3.5 and 3.8 jobs on TravisCI are failing because of the following error running coveralls:

$ coveralls
Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.5.6/bin/coveralls", line 7, in <module>
    from coveralls.cli import main
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/coveralls/__init__.py", line 2, in <module>
    from .api import Coveralls
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/coveralls/api.py", line 13, in <module>
    from .reporter import CoverallReporter
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/coveralls/reporter.py", line 10, in <module>
    from coverage.report import Reporter
ImportError: cannot import name 'Reporter'
The command "coveralls" exited with 1.

The error is the same in the python3.8 job.

Locally, I can from coverage.report import Reporter just fine in both python3.5 and python3.8 environments, so I'm not sure what's going on or how to really debug it.

[bannsec]

My tests are failing with this error with Python 3.6 as well.

[mpu-creare]

Seems related to this: z4r/python-coveralls#73

[mpu-creare]

Seems like the 3.6 env is using coverage 5.0, while the passing 3.7 env is using coverage 4.x.x

[jmilloy]

These guys pin the coverage module in the travel config

script
 - pip install coverage==4.5.4
 ...

Maybe there is something like this that we can do, or similarly maybe we can pin the coveralls version in our setup.py?

[jmilloy]

Okay, pinning coverage worked. See 0a7ba0b

[amykyta3]

Commenting here since this thread shows up in Google searches often.

There's no need to pin to an older version of coveralls.
Instead, make sure you are not installing coverage or python-coveralls as they seem to cause some sort of conflict (See: z4r/python-coveralls#73).

This combination is working for me:

pip install -U pytest pytest-cov coveralls