(self)
return self._before_state_change
Callbacks executed after condition checks but before transition is conducted.
        Callbacks will be executed BEFORE the custom callbacks assigned to the transition.
Callbacks executed after condition checks but before transition is conducted.
        Callbacks will be executed BEFORE the custom callbacks assigned to the transition.
Callbacks executed after condition checks but before transition is conducted . Callbacks will be executed BEFORE the custom callbacks assigned to the transition .
def before_state_change(self):
        """Callbacks executed after condition checks but before transition is conducted.
        Callbacks will be executed BEFORE the custom callbacks assigned to the transition."""
        return self._before_state_change
def before_state_change ( self ) : return self . _before_state_change