'How do I retrieve coordinates from a list containing other items?

So I have a list called 'masterStruc' which contains several items. I am also storing coordinates in this list for later use. However, when I try to retrieve the coordinates from the list I am getting a "TypeError: 'int' object is not subscriptable". Is there anyway I can get the values from the list without getting this error? In the list I have color, some contour data from the approxPolyDP function, the contour area and the x and y coordinates.

#masterStruc appends the relevant data
masterStruc.append([x, approxCurve, contArea, cX, cY])
for z in range(len(masterStruc)):
    #Drawing contours on the source image
    cv2.drawContours(srcImg, [masterStruc[z][1]], 0, drawColor[masterStruc[z][0]], 2)
    cv2.circle(srcImg, masterStruc[z[3][4]], 5, (255, 255, 255), -1)

Any assistance is appreciated

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'How do I retrieve coordinates from a list containing other items?

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