i did try this:

atention for type Empty into msg and srv

for import msg type

from std_msgs.msg import String, Float32, Empty

for import service type without problem Empty

import std_srvs.srv

publish message

take.publish(Empty())

call service

rospy.ServiceProxy('ardrone/flattrim', std_srvs.srv.Empty())

good luck!

for import msg

from std_msgs.msg import String, Float32, Empty Empty

for import service - without problem Empty

import std_srvs.srv publish message

take.publish(Empty())

take.publish(Empty()) call service

rospy.ServiceProxy('ardrone/flattrim', std_srvs.srv.Empty())

good luck!