Python smach userdata key not available

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Hi, I am new to smach and I have some question about userdata in smach. This is my code:

def main():
rospy.init_node('smach_example_state_machine')

sm_top = smach.StateMachine(outcomes=['outcome4','outcome5'],
                          input_keys=['sm_input'],
                          output_keys=['sm_output'])
sm_top.userdata.sm_input=1
with sm_top:
 smach.StateMachine.add('FOO', Foo(),
                        transitions={'outcome1':'BAR',
                                     'outcome2':'outcome4'},
                        remapping={'foo_counter_in':'sm_input',
                                   'foo_counter_out':'sm_data'})
 print 'the number is:  '
 print sm_top.userdata.sm_input
 print 'the number is:  '
 print sm_top.userdata.sm_data

 time.sleep(5)
 smach.StateMachine.add('BAR', Bar(),
                        transitions={'outcome1':'FOO'},
                        remapping={'bar_counter_in':'sm_data',
                                   'bar_counter_out':'sm_output'})

# Execute SMACH plan
outcome = sm_top.execute()

When I tried to print sm_top.userdata.sm_data the program crashed and told me sm_data key is not available. However I can access this key in the state Boo. I understand this might have something to do with pointer.(I would like to know the detail too). My question is: Is there anyway to access sm_top.userdata.sm_data in the main function? Also, is there a way to remap the output of a state to the input of two other states(1 to N)? Thanks!