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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 get_sun_rise_set_transit(self, times, method='pyephem', **kwargs):
 """ Calculate sunrise, sunset and transit times. Parameters times : DatetimeIndex Must be localized to the Location method : str, default 'pyephem' 'pyephem', 'spa', or 'geometric' kwargs are passed to the relevant functions. See solarposition.sun_rise_set_transit_<method> for details. Returns ------- result : DataFrame Column names are: ``sunrise, sunset, transit``. """


        if method == 'pyephem':
            result = solarposition.sun_rise_set_transit_ephem(
                times, self.latitude, self.longitude, **kwargs)
        elif method == 'spa':
            result = solarposition.sun_rise_set_transit_spa(
                times, self.latitude, self.longitude, **kwargs)
        elif method == 'geometric':
            sr, ss, tr = solarposition.sun_rise_set_transit_geometric(
                times, self.latitude, self.longitude, **kwargs)
            result = pd.DataFrame(index=times,
                                  data={'sunrise': sr,
                                        'sunset': ss,
                                        'transit': tr})
        else:
            raise ValueError('{} is not a valid method. Must be '
                             'one of pyephem, spa, geometric'
                             .format(method))
        return result