How to run this Python program

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Can u please help me to find the UUGearDevice usb device id and how to a add to python program. i dont know nothing about python. i opened the voltageMeasrement.py but i dont know how to add the device id to it now when i run that program it is showing that "UUgear device is not correctly initialized . here is the code

from time import sleep
from UUGear import *

UUGearDevice.setShowLogs(0)

device = UUGearDevice('UUGear-Arduino-7853-2668')

if device.isValid():
for i in range(100):
print "%0.2f" % (float(device.analogRead(3)) * 5 / 1024), "V"
sleep(0.2)

device.detach()
device.stopDaemon()
else:
print 'UUGear device is not correctly initialized.'