如何在連接任何東西之前學會這一點。pygtk3檢查信號是否存在
例如
does_signal_exist(widget, signal):
pass
button = Gtk.Button()
does_signal_exist(button, "clicked") # returns True
does_signal_exist(button, "hello") # returns False
does_signal_exist(button, "unboxed") # returns False
does_signal_exist(button, "button-press-event") # returns True