human
I wrote the below code

    if READLINE_DEBUG:
        logging.basicConfig(filename='/tmp/jedi.log', filemode='a', level=logging.DEBUG)
    class JediRL(object, ):
        def complete(self, text, state):
            '\n                                                This    complete    stuff    is    pretty    weird,    a    generator    would    make\n                                                a    lot    more    sense,    but    probably    due    to    backwards    compatibility\n                                                this    is    still    the    way    how    it    works.\n\n                                                The    only    important    part    is    stuff    in    the    ``state    ==    0``    flow,\n                                                everything    else    has    been    copied    from    the    ``rlcompleter``    std.\n                                                library    module.\n                                                '
            if (state == 0):
                sys.path.insert(0, os.getcwd())
                try:
                    logging.debug(('Start    REPL    completion:    ' + repr(text)))
                    interpreter = Interpreter(text, [namespace_module.__dict__])
                    lines = common.splitlines(text)
                    position = (len(lines), len(lines[(-1)]))
                    name = get_on_completion_name(interpreter._get_module_node(), lines, position)
                    before = text[:(len(text) - len(name))]
                    completions = interpreter.completions()
                except:
                    logging.error(('REPL    Completion    error:\n' + traceback.format_exc()))
                    raise
                finally:
                    sys.path.pop(0)
                self.matches = [(before + c.name_with_symbols) for c in completions]
            try:
                return self.matches[state]
            except IndexError:
                return None
    try:
        import readline
    except ImportError:
      ...

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

def setup_readline(namespace_module=__main__):