def install
  # Create a virtualenv in `libexec`. If your app needs Python 3, make sure that
  # `depends_on :python3` is declared, and use `virtualenv_create(libexec, "python3")`.
  venv = virtualenv_create(libexec)
  # Install all of the resources declared on the formula into the virtualenv.
  venv.pip_install resources
  # `link_scripts` takes a look at the virtualenv's bin directory before and
  # after executing the block which is passed into it. If the block caused any
  # new scripts to be written to the virtualenv's bin directory, link_scripts
  # will symlink those scripts into the path given as its argument (here, the
  # formula's `bin` directory in the Cellar.)
  # `pip_install buildpath` will install the package that the formula points to,
  # because buildpath is the location where the formula's tarball was unpacked.
  venv.link_scripts(bin) { venv.pip_install buildpath }
end