def _get_field_values(self):
    for (i, row) in self.df[self.df.columns].iterrows():
        (yield [self._get_value(v) for v in row])
def _get_field_values(self):
    for (i, row) in self.df[self.df.columns].iterrows():
        (yield [self._get_value(v) for v in row])