def parse_if_range_header(value):
    if not value:
        return IfRange()
    date = parse_date(value)
    if date is not None:
        return IfRange(date=date)
    # drop weakness information
    return IfRange(unquote_etag(value)[0])
Return the order of self when requested by len().
dataset/ETHPy150Open Eforcers/gae-flask-todo/lib/werkzeug/http.py/parse_if_range_header--crossover with--dataset/ETHPy150Open nerdvegas/rez/src/rez/vendor/pygraph/mixins/common.py/common.__len__