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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _GetTable(self):
 """Returns table, with column headers and separators. Returns: The whole table including headers as a string. Each row is joined by a newline and each entry by self.separator. """

    result = []
    # Avoid the global lookup cost on each iteration.
    lstr = str
    for row in self._table:
      result.append(
          '%s\n' %
          self.separator.join(lstr(v) for v in row))

    return ''.join(result)