Parses final free energy information from single-point calculations.

def _read_single_point_data(self):
        """
        Parses final free energy information from single-point calculations.
        """
        temp_dict = read_pattern(
            self.text, {
                "final_energy":
                    r"\s*SCF\s+energy in the final basis set\s+=\s*([\d\-\.]+)"
            })

        if temp_dict.get('final_energy') == None:
            self.data['final_energy'] = None
        else:
            # -1 in case of pcm
            # Two lines will match the above; we want final calculation
            self.data['final_energy'] = float(temp_dict.get('final_energy')[-1][0])