如何在pygtk中将一个键压缩成另一个键

I'm trying to make my pygtk application behave the way openoffice calc does, regarding the decimal point. This means that when receiving a KP_Decimal key (the dot in the keypad) I want my entries to show whatever the decimal point is in the current locale (dot or comma, appropriately).I'm trying to make my pygtk application behave