Build errors installing a common dependency (docopt) on python 3.7 but not other versions

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That was a helpful suggestion. I adjusted my travis.yml file to conditionally downgrade pip to the last working version (20.1):

before_install:
 - if [[ $TRAVIS_PYTHON_VERSION == 3.7 ]]; then pip install pip==20.1; fi

This runs correctly but the job still fails with the same error. It appears to have something to do with the importlib_metadata package-- I tried pip install -U importlib_metadata and that solved it! see: Travis CI - Test and Deploy with Confidence

before_install:
 - if [[ $TRAVIS_PYTHON_VERSION == 3.7 ]]; then pip install -U importlib_metadata; fi