source.py 文件源码

def versions(self) -> Set[Version]:
        if self._versions is not None:
            return self._versions
        if self._data_versions is None:
            return None

        versions = set()
        for version_str in self._data_versions:
            try:
                version = Version(version_str)
            except InvalidVersion:
                logging.info("Got invalid version for {}: {}".format(self.package.get_name(), version_str))
                continue
            versions.add(version)

        self._versions = versions
        return self._versions