publish list of lists with Python

edit

ROS can not publish 2D arrays. Alternatively you can publish a 1D array (use message int32[] data)

import rospy
import numpy as np

from iot_humans_track.msg import int_array1d

if __name__ == "__main__":
rospy.init_node('pub', anonymous=True)

data = np.array([[1,2,3], [4,5,6]])

#Convert to 1d array
data_1d = np.reshape(data,6) 

puber = rospy.Publisher('topic', int_array1d, queue_size=10)
while not rospy.is_shutdown():
    puber.publish(data_1d)

and convert it later as follows:

import rospy
import numpy as np
from iot_humans_track.msg import int_array1d

def callback(msg):

    data_2d = np.reshape(msg.data,(-1,3))
    print data_2d

if __name__ == "__main__":
    rospy.init_node('sub', anonymous=True)
    sub_node = rospy.Subscriber('topic', int_array1d, callback, queue_size=10) 
    rospy.spin()

There is an inconsistency in your question. You first say that your messages are int_list_1d.msg and int_list_2d.msg but then you create an int_array2d-message.

msg_list = int_list_2d()
msg_lists.data <- this is a list of int_list_1d-messages and not a list of int32-lists.

So you'd rather have to go for

msg_list = int_list_2d()
msg_list.data.append(int_list_1d(data=[1,2,3])
msg_list.data.append(int_list_1d(data=[1,2])

"despite the fact that the catkin_make is completed without errors"

Well, python is a language without strict data types, so it's no big surprise that you find type errors at runtime. If you want to find problems like this earlier, use something like C++