python3 -m pip install pip==10.0.1
python3 -m pip install pipenv==2018.5.18
python3 -m pip install --upgrade pip
python3 -m pip install --upgrade pipenv
pip 18.1: pipenv graph results in ImportError: cannot import name 'get_installed_distributions'
原文：https://www.cnblogs.com/c-x-a/p/9765332.html