大概
def on_key(event, arg1, arg2, arg3):
和
fig.canvas.mpl_connect('key_press_event', lambda event: on_key(event, plt1, plt2, plt3))或作为清单
def on_key(event, args_list):
和
fig.canvas.mpl_connect('key_press_event', lambda event: on_key(event, [plt1, plt2, plt3]))
