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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 getRow(self, key):
 """ Get a row by value of the indexing columns. If the index is not specified, gets the only row of a dataframe with no indexing columns. Args: key: Tuple representing the index of the desired row. Returns: The row. """

        return Row(self._impl.getRow(Tuple(key)._impl))