Function returns a list of string dates in YYYY-MM-DD format between and including start and end date.

date_list.py

import datetime as dt


def list_of_dates(start_date, end_date):
    """
    Function returns a list of string dates in YYYY-MM-DD format between and including start and end date.
    :param start_date: Start date string in YYYY-MM-DD format
    :param end_date: End date string in YYYY-MM-DD format
    :return: List of date strings
    """

    start_date = dt.datetime.strptime(start_date, "%Y-%m-%d")
    end_date = dt.datetime.strptime(end_date, "%Y-%m-%d")

    try:
        assert(start_date < end_date)
        dates_to_return = []

        d0 = start_date
        while d0 <= end_date:
            dates_to_return.append(d0.strftime("%Y-%m-%d"))
            d0 += dt.timedelta(days=1)

        return dates_to_return
    except AssertionError:
        raise AttributeError("Start date not less than end date.")

# usage: print list_of_dates("2016-01-01", "2016-01-12")
# ['2016-01-01', '2016-01-02', '2016-01-03', '2016-01-04', '2016-01-05', '2016-01-06',
# '2016-01-07', '2016-01-08', '2016-01-09', '2016-01-10', '2016-01-11', '2016-01-12']