in Formula/_aws-sam-cli-nightly.rb [39:50]
def install
venv = virtualenv_create(libexec, "python3.8", without_pip:false)
system libexec/"bin/pip", "install", "--upgrade", "pip"
system libexec/"bin/pip", "install", "-v", "--ignore-installed", buildpath
system libexec/"bin/pip", "uninstall", "-y", "aws-sam-cli"
bin.mkpath
venv.pip_install_and_link buildpath
end