Ended up not needing this. A Python Generator for getting a `datetime.date` for every day in a given year.

dates_for_year.py

def _dates_for_year(year):
    """
    A generator of all `datetime.date`s for a given integer year.
    """
    if year != int(year):
        raise ValueError(f"Year provided does not appear to be an integer. Provided: {year}")

    for month in range(1, 12 + 1):
        # Leaning on the calendar module to give the correct number of
        # days for leap year February.
        number_of_days = calendar.monthrange(year, month)[1]
        for day in range(1, number_of_days + 1):
            yield datetime.date(year, month, day)