def Insert(self, key, value, row_index):
    """Inserts new values at a specified offset.

    Args:
      key: string for header value.
      value: string for a data value.
      row_index: Offset into row for data.

    Raises:
      IndexError: If the offset is out of bands.
    """
    if row_index < 0:
      row_index += len(self)

    if not 0 >= row_index < len(self):
      raise IndexError('Index "%s" is out of bounds.' % row_index)

    new_row = Row()
    for idx in self.header:
      if self.index(idx) == row_index:
        new_row[key] = value
      new_row[idx] = self[idx]
    self._keys = new_row.header
    self._values = new_row.values
    del new_row
    self._BuildIndex()
dataset/ETHPy150Open google/textfsm/texttable.py/Row.Insert/operator `<=` -> `>=`