def df_first_row_to_dict(df):
        """First DataFrame row to list of dict

        Args:
            df (pandas.DataFrame): A DataFrame with at least one row

        Returns:
            A list of dict that looks like:

                [{'C1': 'x'}, {'C2': 'y'}, {'C3': 'z'}]

            from a DataFrame that looks like:

                    C1  C2  C3
                1   x   y   z

            Else if `df` is `None`, returns `None`
        """
        if df is not None:
            return [dict(r) for i, r in df.head(1).iterrows()][0]
First DataFrame row to list of dict

        Args:
            df (pandas.DataFrame): A DataFrame with at least one row

        Returns:
            A list of dict that looks like:

                [{'C1': 'x'}, {'C2': 'y'}, {'C3': 'z'}]

            from a DataFrame that looks like:

                    C1  C2  C3
                1   x   y   z

            Else if `df` is `None`, returns `None`