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What you want is:

for (x,y) in currFeatures:
    for (px,py) in self.prev_draw_features:
        cv.line(new_image, (px,py),(x,y),cv.RGB(125, 20,200),5)

What you probably want is:

for (x,y) ((x,y), (px,py)) in currFeatures:
    for (px,py) in self.prev_draw_features:
zip(currFeatures, self.prev_draw_features):
        cv.line(new_image, (px,py),(x,y),cv.RGB(125, 20,200),5)

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