def GenerateDiff(self, args):
    """Return the current diff as a string.

    Args:
      args: Extra arguments to pass to the diff command.
    """
    raise NotImplementedError(
        "abstract method -- subclass %s must override" % self.__class__)
dataset/ETHPy150Open CollabQ/CollabQ/bin/upload.py/VersionControlSystem.GenerateDiff/original