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        def daterange(*args):
    '''Returns an iterator that yields each date in the range of ``[start,
    stop)``, not including the stop.

    If `start` is given, it must be a date (or `datetime`) value; and in this
    case only `stop` may be an integer meaning the numbers of days to look
    ahead (or back if `stop` is negative).

    If only `stop` is given, `start` will be the first day of stop's month.

    `step`, if given, should be a non-zero integer meaning the numbers of days
    to jump from one date to the next. It defaults to ``1``. If it's positive
    then `stop` should happen after `start`, otherwise no dates will be
    yielded. If it's negative `stop` should be before `start`.

    As with `range`, `stop` is never included in the yielded dates.

    import operator
    # Use base classes to allow broader argument values
    from datetime import date, datetime
    if len(args) == 1:
        start, stop, step = None, args[0], None
    elif len(args) == 2:
        start, stop = args
        step = None
        start, stop, step = args
    if not step and step is not None:
        raise ValueError('Invalid step value %r' % step)
    if not start:
        if not isinstance(stop, (date, datetime)):
            raise TypeError('stop must a date if start is None')
            start = get_month_first(stop)
        if stop is not None and not isinstance(stop, (date, datetime)):
            stop = start + timedelta(days=stop)
    if step is None or step > 0:
        compare = operator.lt
        compare = operator.gt
    step = timedelta(days=(step if step else 1))

    # Encloses the generator so that signature validation exceptions happen
    # without needing to call next().
    def _generator():
        current = start
        while stop is None or compare(current, stop):
            yield current
            current += step
    return _generator()

src/x/o/xoutil-1.5.4/tests/test_datetime.py   xoutil(Download)
from xoutil.datetime import date
from xoutil.datetime import daterange
def test_daterange_stop_only():
    result = list(daterange(date(1978, 10, 21)))
def test_daterange_empty():
    assert [] == list(daterange(date(1978, 10, 21), -2))
    assert [] == list(daterange(date(1978, 10, 21), date(1978, 10, 10)))
    assert [] == list(daterange(date(1978, 10, 10), date(1978, 10, 20), -1))