code: def _bind_key(self, key, func):
          u
          if not callable(func):
              print u"Trying to bind non method to keystroke:%s,%s"%(key,func)
              raise ReadlineError(u"Trying to bind non method to keystroke:%s,%s,%s,%s"%(key,func,type(func),type(self._bind_key)))
          keyinfo = make_KeyPress_from_keydescr(key.lower()).tuple()
          log(u">>>%s -> %s<<<"%(keyinfo,func.__name__))
          self.key_dispatch[keyinfo] = func
docs: u"""setup the mapping from key to call the function.