Gets the locally stored version of a manylinux wheel. If one does not exist, the function downloads it.

def get_cached_manylinux_wheel(self, package_name, package_version, disable_progress=False):
        """
        Gets the locally stored version of a manylinux wheel. If one does not exist, the function downloads it.
        """
        cached_wheels_dir = os.path.join(tempfile.gettempdir(), 'cached_wheels')
        if not os.path.isdir(cached_wheels_dir):
            os.makedirs(cached_wheels_dir)

        wheel_file = '{0!s}-{1!s}-{2!s}'.format(package_name, package_version, self.manylinux_wheel_file_suffix)
        wheel_path = os.path.join(cached_wheels_dir, wheel_file)

        if not os.path.exists(wheel_path) or not zipfile.is_zipfile(wheel_path):
            # The file is not cached, download it.
            wheel_url = self.get_manylinux_wheel_url(package_name, package_version)
            if not wheel_url:
                return None

            print(" - {}=={}: Downloading".format(package_name, package_version))
            with open(wheel_path, 'wb') as f:
                self.download_url_with_progress(wheel_url, f, disable_progress)

            if not zipfile.is_zipfile(wheel_path):
                return None
        else:
            print(" - {}=={}: Using locally cached manylinux wheel".format(package_name, package_version))

        return wheel_path