import sys
from datetime import date
import yaml

potus = {
    'presidents': [
         {
            'lastname': 'Washington',
            'firstname': 'George',
            'dob': date(1732, 2, 22),
            'dod': date(1799, 12, 14),
            'birthplace': 'Westmoreland County',
            'birthstate': 'Virginia',
            'term': [ date(1789, 4, 30), date(1797, 3, 4) ],
            'assassinated': False,
            'party': None,
        },
        {
            'lastname': 'Adams',
            'firstname': 'John',
            'dob': date(1735, 10, 30),
            'dod': date(1826, 7, 4),
            'birthplace': 'Braintree, Norfolk',
            'birthstate': 'Massachusetts',
            'term': [date(1797, 3, 4), date(1801, 3, 4)],
            'assassinated': False,
            'party': 'Federalist',

        }
    ]
}

with open('potus.yaml', 'w') as potus_out:
    yaml.dump(potus, potus_out)

yaml.dump(potus, sys.stdout)