human
Solve the following python programming problem given the following code:
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_key : 
        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) : 
                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) 

    
    

    Fix the buggy line: for conf_key in conf_key :
assistant
#Here is Python code to fix the buggy line: for conf_key in conf_key :
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for conf_key in conf :