human
I wrote the below code

    import zlib
    with open(__file__, 'rb') as f:
        arg = (f.read(5000) * 3)
    def compress(s):
        zlib.decompress(zlib.compress(s, 5))
    return (compress, (arg,))

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

def task_compress_zlib():