[Python] how can I filter on the second element in a tuple of tuples?

In my model I have a field:

country = models.CharField(_('Country'), max_length=2, choices=COUNTRIES)


Where COUNTRIES is a tuple of tuples like this:

COUNTRIES = (
('AF', _('Afghanistan')),


... and so on

Now I want to filter an instance of that model, by the country name.

This:

i = MyModel.objects.filter(country__iexact=query)


only lets me filter by the country code.

How can I filter by country name?

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