python - mat is not a numerical tuple : openCV error -

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i have write down code showing error ma not getting it: please help: showing mat not numerical tuple:

import cv import cv2 capture = cv2.videocapture("j.3gp")  while(1):      _, frame1 = capture.read()      grayimage1 = cv2.cvtcolor(frame1, cv2.color_bgr2gray)     _, frame2 = capture.read()     grayimage2 = cv2.cvtcolor(frame2, cv2.color_bgr2gray)     differenceimage = cv2.absdiff(grayimage1,grayimage2)     thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary)     cv2.imshow("difference image", differenceimage)     cv2.imshow("threshold image", thresholdimage)     cv2.imshow("image", frame1)     k = cv2.waitkey(30) & 0xff   error arising : -----------------------------------------------------------------------------------------  traceback (most recent call last):   file "desk.py", line 15, in <module>     cv2.imshow("threshold image", thresholdimage) typeerror: mat not numerical tuple

i got anaswer self "cv2.threshould" returns 2 values , adding variable @ starting rectify error given bellow did in "capture.read()"

thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary)

should be: 

_ ,thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary)

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