daterange.py

def daterange(date, to=None):
    condition = lambda x: (x <= to) if to else lambda x: True
    step = datetime.timedelta(days=1)
    while condition(date):
        yield date
        date += step
        

def inclusive_daterange(date, to=None):
    if to:
        to = to + datetime.timedelta(days=1)
    return daterange(date, to)