Endless execution with proper thread handling

UDP-client-server.py

 import socket
 import time
 import sys
-from threading import Thread
+import threading
+from threading import Thread, Timer
 import numpy as np
 from array import *
 
@@ -66,8 +67,10 @@ def udp_client_receive(UDP_RECEIVE_IP, UDP_RECEIVE_PORT):
 
         rt_delay_array.append(rt_delay)
 
-        print((time.ctime() + ',' + 'received , ' +
-               packet_number + ' , ' + str(rt_delay)))
+# Comment this line to disable per packet print
+
+        #print((time.ctime() + ',' + 'received , ' +
+               #packet_number + ' , ' + str(rt_delay)))
 
 # Store minimum and maximum delay
         if rt_delay > max_delay:
@@ -127,7 +130,8 @@ def udp_client_send(UDP_DEST_IP,  UDP_DEST_PORT,
 
     PLR = 100 - ((packet_count_rcvd * 100.) / packet_count_snd)
 
-    print('\n', packet_count_snd,  'packets sent')
+    print('\n')
+    print(packet_count_snd,  'packets sent')
     print(packet_count_rcvd,  'packets received')
     print('packet loss ratio = ',  round(PLR, 3),  '%')
 
@@ -147,8 +151,10 @@ def udp_client_send(UDP_DEST_IP,  UDP_DEST_PORT,
     else:
         avg_packet_delay = cumulative_delay / packet_count_rcvd
 #CALCULATE STABILITY
-        network_stability = int(((packet_count_rcvd/packet_count_snd)*(avg_packet_delay/packet_wait_time)*100)+0.5)
+        network_stability = int(((packet_count_rcvd / packet_count_snd)\
+                                 * (avg_packet_delay / packet_wait_time) * 100) + 0.5)
         print('avg.rtt = ', avg_packet_delay)
+        print('stability = ', network_stability)
 
 
 #START THE THREADS FOR SENDER AND RECEIVER
@@ -158,7 +164,17 @@ if __name__ == "__main__":
     receiver_thread.daemon = True
     receiver_thread.start()
     time.sleep(1)
+    while threading.activeCount() <= 2:
+
+        # Set the count of the received packets to 0,
+        # since the listener thread runs continously
+        packet_count_rcvd = 0
+        packet_count_snd = 0
+
         sender_thread = Thread(target=udp_client_send,
                             args=(UDP_DEST_IP,  UDP_DEST_PORT,
                                     PACKET_SIZE,  NR_OF_PACKETS,
-                                 PACKETS_PER_SEC)).start()
+                                    PACKETS_PER_SEC))
+        sender_thread.start()
+        while sender_thread.is_alive():
+            time.sleep(1)