code: def merge(
      left,
      right,
      how="inner",
      on=None,
      left_on=None,
      right_on=None,
      left_index=False,
      right_index=False,
      sort=False,
      suffixes=("_x", "_y"),
      copy=True,
      indicator=False,
      validate=None,
  ):
      if not isinstance(left, DataFrame):
          raise ValueError(
              "can not merge DataFrame with instance of type {}".format(type(right))
          )
      return left.merge(
          right,
          how=how,
          on=on,
          left_on=left_on,
          right_on=right_on,
          left_index=left_index,
          right_index=right_index,
          sort=sort,
          suffixes=suffixes,
          copy=copy,
          indicator=indicator,
          validate=validate,
      )