def __iter__(self):
        if com.is_datetimelike(self):
            return (_maybe_box_datetimelike(x) for x in self._values)
        else:
            return iter(self._values)
Filter returns only countries
dataset/ETHPy150Open pydata/pandas/pandas/core/series.py/Series.__iter__--crossover with--dataset/ETHPy150Open ramusus/django-geonames/geonames/models.py/GeonameManager.countries