from datetime import datetime, timedelta

PYBITES_BORN = datetime(year=2016, month=12, day=19)


def my_gen_special_pybites_dates():
    days = 1
    while True:
        dt = PYBITES_BORN + timedelta(days=days)
        # if days % 100 == 0:  # commented to print only 'every year'
        #         yield dt
        if dt.month == PYBITES_BORN.month and dt.day == PYBITES_BORN.day:
            yield dt
        days += 1


def gen_special_pybites_dates():
    days = 0
    while True:
        days += 1
        if days % 365 == 0:  # without every 100 days
            yield PYBITES_BORN + timedelta(days=days)


if __name__ == '__main__':
    # my func to gen pybites dates
    gen = my_gen_special_pybites_dates()

    from itertools import islice
    dates = list(islice(gen, 100))
    for date in dates:
        print(date.strftime('%Y-%m-%d'))

    print('-----------------------------')

    # pybites solution
    gen = gen_special_pybites_dates()

    from itertools import islice
    dates = list(islice(gen, 100))
    for date in dates:
        print(date.strftime('%Y-%m-%d'))