<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def keypress(self, event):
 """Allow keys typed in widget to select items"""

        try:
            self.choice.set(self.shortcuts[event.keysym])
        except KeyError:
            # key not found (probably a bug, since we intend to catch
            # only events from shortcut keys, but ignore it anyway)
            pass