Publish a complex msg on a topic

edit

Something like :

pub_People = rospy.Publisher('people', People);

And the I change the value of the people.age before publishing ?

People.age =10
pub_People .publish(people.age)

Yes, that is the gist of it.

You'd work with an instance of the message though, not the People class itself. So:

from wherever.msg import People
...
pub_People = rospy.Publisher('people', People)
...
my_msg = People()
my_msg.age = 10
my_msg....
...
pub_People.publish(my_msg)

I've skipped things like initialisation and spinning, be sure to add those as well.