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Mixture of OpenCV version?

I'm confused about the following code in crop_plates.py at https://github.com/openalpr/train-detector:

import os
import sys
import json
import math
import cv, cv2

... 

moment = cv.Moments(points)

...

        cv2.randu(crop_img, (0,0,0), (255,255,255))

It seems to use different version of OpenCV. But I have problems to install different OpenCV at the same time so that I change the code to only use cv2. Here comes a new question. There is no Moments function at cv2, or at least the function is different. Here is my code:

   points = [(x1,y1), (x2,y2), (x3,y3), (x4,y4)]
# moment = cv.Moments(points)
   moment = cv2.moments(points)
   centerx = int(round(moment.m10/moment.m00))
   centery = int(round(moment.m01/moment.m00))

But I got the following error message:

moment = cv2.moments(points)

TypeError: array is not a numpy array, neither a scalar

Any idea?