pip no longer invoked by an old script wrapper. #2623
Merged
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while debugging an error I encountered while running setup.py I also saw pip.main was used to installed packages. installing packages through pip.main (pip.main(["install", RUAMEL_YAML_VERSION])) is not recommended, and will be removed from future versions of pip.
pypa/pip#5599
https://pip.pypa.io/en/latest/user_guide/#using-pip-from-your-program