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Assigning unique identifier to shapes in real-time

Dear all,

Suppose I wish to keep track of multiple shapes that is detected via approxPolyDP in real-time (example: there are 3 individual triangles). How could I go about naming those triangles 1, 2 and 3? As I need to perform an operation starting from the left-most triangle. Here is my base code for shape detection.

canny_white, contours, hierarchy = cv2.findContours(white_mask,cv2.RETR_CCOMP,cv2.CHAIN_APPROX_SIMPLE)

for i in range(0,len(contours)):

    approx = cv2.approxPolyDP(contours[i],cv2.arcLength(contours[i],True)*0.02,True)

    if(len(approx) == 3):
        x,y,w,h = cv2.boundingRect(contours[i])
        cv2.putText(frame,"Triangle",(x,y),cv2.FONT_HERSHEY_SIMPLEX,1.5,(255,0,0),2,cv2.LINE_AA)

Thank you.