from datetime import datetime

start_time = datetime.now() 

### ADD LOOP 
for a_device in all_devices:
    net_connect = ConnectHandler(**a_device)
    output = net_connect.send_command("show arp") 
    print(f"\n\n--------- Device {a_device['device_type']} ---------")
    print(output)
    print("--------- End ---------") 

end_time = datetime.now()
total_time = end_time - start_time 

print(total_time)