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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 entries(self):
 """ Entries of the CoordinateMatrix stored as an RDD of MatrixEntries. MatrixEntry(0, 0, 1.2) """

        # We use DataFrames for serialization of MatrixEntry entries
        # from Java, so we first convert the RDD of entries to a
        # DataFrame on the Scala/Java side. Then we map each Row in
        # the DataFrame back to a MatrixEntry on this side.
        entries_df = callMLlibFunc("getMatrixEntries", self._java_matrix_wrapper._java_model)
        entries = entries_df.rdd.map(lambda row: MatrixEntry(row[0], row[1], row[2]))
        return entries