def FileExtension(self):
    if self._compress:
      return 'tgz'
    else:
      return 'tar'
insert <index> <object>
dataset/ETHPy150Open google/apis-client-generator/src/googleapis/codegen/filesys/tar_library_package.py/TarLibraryPackage.FileExtension--crossover with--dataset/ETHPy150Open kdart/pycopia/fepy/pycopia/fepy/CLI.py/ListCLI.insert