def _get_basename(self, file):
        """
        @type file: C{str}
        @param file: full filename
        @return: the basename of the specified file
        @rtype: C{str}
        """
        return file[0:4-len(file)]
dataset/ETHPy150Open cidles/graf-python/nltk/masc.py/MascCorpusReader._get_basename/swapped operands of `-`