custom messge usage in python

edit

i wrote a smal python node

#!/usr/bin/env python3
import rospy
from ros_agv.msg import MotorStates 
from ros_agv.msg import MotorCmds 
from ros_agv.msg import MotorState
from ros_agv.msg import MotorCmd
rospy.init_node('motor')
pub = rospy.Publisher('motorStates' , MotorStates)
rate = rospy.Rate(50)

while not rospy.is_shutdown():
  msg = MotorStates
  motor1 = MotorState
  msg.state = [motor1,motor1,motor1,motor1]

  pub.publish(msg)
  rate.sleep()

package.xml

<build_depend>message_generation</build_depend>
<exec_depend>message_runtime</exec_depend>

cmakelist.txt

find_package(catkin REQUIRED COMPONENTS
  rospy
  std_msgs
 message_generation
)
add_message_files(
  FILES
  MotorCmd.msg
  MotorState.msg
  MotorCmds.msg
  MotorStates.msg
)
generate_messages(
DEPENDENCIES
std_msgs  # Or other packages containing msgs
)

catkin_package(
  CATKIN_DEPENDS message_runtime
#  INCLUDE_DIRS include
#  LIBRARIES ros_agv
CATKIN_DEPENDS rospy
#  DEPENDS system_lib
)

the output of ~/ws$ rosmsg list | grep ros_agv is

ros_agv/MotorCmd
ros_agv/MotorCmds
ros_agv/MotorState
ros_agv/MotorStates

when i try to start the node in the same terminal rosrun ros_agv motor.py i get the output:

Traceback (most recent call last):
  File "/home/anton/ws/src/ros_agv/script/motor.py", line 4, in <module>
    from ros_agv.msg import MotorStates 
  ImportError: cannot import name 'MotorStates' from 'ros_agv.msg' (unknown location)