odps/mars_extension/legacy/filesystem.py [254:274]:
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        path = path.strip("/") or self._path
        if "/" not in path:
            path = "{}/{}".format(self._path, path)
        options = VolumeFileSystem.parse_from_path(path)
        fpath = options["path"]

        splits = fpath.split("/")
        if len(splits) == 3:
            is_file = False
        elif len(splits) == 4:
            is_file = True
        else:
            raise ValueError(
                "Argument `path` illegal, expect to be "
                "odps:///**project**/volumes/**volume**/ or"
                "odps:///**project**/volumes/**volume**/**partition**/, "
                "got {}".format(path)
            )

        if is_file:
            project, volume, partition = self._extract_info(path, is_file=True)
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odps/mars_extension/oscar/filesystem.py [308:328]:
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        path = path.strip("/") or self._path
        if "/" not in path:
            path = "{}/{}".format(self._path, path)
        options = VolumeFileSystem.parse_from_path(path)
        fpath = options["path"]

        splits = fpath.split("/")
        if len(splits) == 3:
            is_file = False
        elif len(splits) == 4:
            is_file = True
        else:
            raise ValueError(
                "Argument `path` illegal, expect to be "
                "odps:///**project**/volumes/**volume**/ or"
                "odps:///**project**/volumes/**volume**/**partition**/, "
                "got {}".format(path)
            )

        if is_file:
            project, volume, partition = self._extract_info(path, is_file=True)
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