human
I wrote the below code

    global _IP_REGISTERED
    global _INSTALL_FIG_OBSERVER
    class _NotIPython(Exception, ):
        pass
    try:
        if (u'IPython' in sys.modules):
            from IPython import get_ipython
            ip = get_ipython()
            if (ip is None):
                raise _NotIPython()
            if _IP_REGISTERED:
                return
            def post_execute():
                if matplotlib.is_interactive():
                    draw_all()
            try:
                ip.events.register(u'post_execute', post_execute)
            except AttributeError:
                ip.register_post_execute(post_execute)
            _IP_REGISTERED = post_execute
            _INSTALL_FIG_OBSERVER = False
            from IPython.core.pylabtools import backend2gui
            ipython_gui_name = backend2gui.get(get_backend())
            if ipython_gui_name:
                ip.enable_gui(ipython_gui_name)
        else:
            _INSTALL_FIG_OBSERVER = True
    except (ImportError, _NotIPython):
        _INSTALL_FIG_OBSERVER = True

What's a good function header?

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

def install_repl_displayhook():