def interpret_conf_limits(conf, name_prefix, info=None):
    """
    Parses general parms for rate limits looking for things that
    start with the provided name_prefix within the provided conf
    and returns lists for both internal use and for /info

    :param conf: conf dict to parse
    :param name_prefix: prefix of config parms to look for
    :param info: set to return extra stuff for /info registration
    """
    conf_limits = []
    for conf_key in conf:
        if conf_key.startswith(name_prefix):
            cont_size = int(conf_key[len(name_prefix):])
            rate = float(conf[conf_key])
            conf_limits.append((cont_size, rate))

    conf_limits.sort()
    ratelimits = []
    conf_limits_info = list(conf_limits)
    while conf_limits:
        cur_size, cur_rate = conf_limits.pop(0)
        if conf_limits:
            next_size, next_rate = conf_limits[0]
            slope = (float(next_rate) - float(cur_rate)) \
                / (next_size - cur_size)

            def new_scope(cur_size, slope, cur_rate):
                # making new scope for variables
                return lambda x: (x - cur_size) * slope + cur_rate
            line_func = new_scope(cur_size, slope, cur_rate)
        else:
            line_func = lambda x: cur_rate

        ratelimits.append((cur_size, cur_rate, line_func))
    if info is None:
        return ratelimits
    else:
        return ratelimits, conf_limits_info
dataset/ETHPy150Open openstack/swift/swift/common/middleware/ratelimit.py/interpret_conf_limits/original