human
I wrote the below code

    def set_pop(set, item):
        set.remove(item)
        return item
    headers = defaultdict(list)
    keys = set()
    for (key, value) in kvset:
        headers[key].append(value)
        keys.add(key)
    return [(set_pop(keys, k), '\x00'.join(headers[k])) for (k, v) in kvset if (k in keys)]

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def combine_repeated_headers(kvset):