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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _brute_force_install_pip(self):
 """A brute force install of pip itself."""

        if os.path.exists(self.pip_installer_fname):
            logger.debug("Using pip installer from %r", self.pip_installer_fname)
        else:
            logger.debug(
                "Installer for pip not found in %r, downloading it", self.pip_installer_fname)
            self._download_pip_installer()

        logger.debug("Installing PIP manually in the virtualenv")
        python_exe = os.path.join(self.env_bin_path, "python")
        helpers.logged_exec([python_exe, self.pip_installer_fname, '-I'])
        self.pip_installed = True