I tried to publish and subscribe to the list of tuples. Unfortunately, I can't.

My code for slave or talker is:

#!/usr/bin/env python

import rospy
from std_msgs.msg import Float32MultiArray

def talker():
    pub = rospy.Publisher('chatter', Float32MultiArray, queue_size=1)
    rospy.init_node('talker', anonymous=True)
    rate = rospy.Rate(10) # 10hz
    while not rospy.is_shutdown():
        hello_str = [(360, 196, 558, 460), (184, 183, 342, 477)]
        array = Float32MultiArray(data=hello_str)
        # print 'gggggggggggggggggggggggg', type(array)
        rospy.loginfo(array)
        pub.publish(array)
        rate.sleep()

if __name__ == '__main__':
    try:
        talker()
    except rospy.ROSInterruptException:
        pass

The output is :

[INFO] [1652334923.612873]: layout: 
  dim: []
  data_offset: 0
data: 
  - [360, 196, 558, 460]
  - [184, 183, 342, 477]
[INFO] [1652334923.713173]: layout: 
  dim: []
  data_offset: 0
data: 
  - [360, 196, 558, 460]
  - [184, 183, 342, 477]
[INFO] [1652334923.813342]: layout: 
  dim: []
  data_offset: 0
data: 
  - [360, 196, 558, 460]
  - [184, 183, 342, 477]
[INFO] [1652334923.913261]: layout: 
  dim: []
  data_offset: 0
data: 
  - [360, 196, 558, 460]
  - [184, 183, 342, 477]
[INFO] [1652334924.013226]: layout: 
  dim: []
  data_offset: 0
data: 
  - [360, 196, 558, 460]
  - [184, 183, 342, 477]

I need the output will be:

data : [(360, 196, 558, 460), (184, 183, 342, 477)] 

The code for slave or listener is:

#!/usr/bin/env python

import rospy
from std_msgs.msg import Float32MultiArray

def callback(data):
    # rospy.loginfo(data.data)
    a = list (data.data)
    print (a)

def listener():
    rospy.init_node('listener', anonymous=True)

    rospy.Subscriber("chatter", Float32MultiArray, callback)

    rospy.spin()

if __name__ == '__main__':
    listener()

No output for listener code but when I ran it the talker code stopped and give me this message:

Traceback (most recent call last):
  File "/home/redhwan/learn1.py", line 20, in <module>
    talker()
  File "/home/redhwan/learn1.py", line 15, in talker
    pub.publish(array)
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/topics.py", line 886, in publish
    raise ROSSerializationException(str(e))
rospy.exceptions.ROSSerializationException: <class 'struct.error'>: 'required argument is not a float' when writing '0'

Thank you in advance for your help.

Note: If the list like [1.1,2,3,4,5]. It is working fine.