There seems to be a syntax error in the first line of the code. The correct syntax should be:

import cv2 import numpy as np

Also, the code is drawing contours on the same image repeatedly, which may not be desirable. It is better to create separate images for each contour and display them separately. Here is an updated version of the code:

import cv2 import numpy as np

img = cv2.imread('practice.png', 0)

contours, hierarchy = cv2.findContours(img, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

Draw first contour

img1 = np.zeros_like(img) img1 = cv2.drawContours(img1, contours, 0, 128, -1) cv2.imshow('Contour 1', img1)

Draw second contour

img2 = np.zeros_like(img) img2 = cv2.drawContours(img2, contours, 1, 200, -1) cv2.imshow('Contour 2', img2)

Draw third contour

img3 = np.zeros_like(img) img3 = cv2.drawContours(img3, contours, 2, 200, -1) cv2.imshow('Contour 3', img3)

Draw fourth contour

img4 = np.zeros_like(img) img4 = cv2.drawContours(img4, contours, 3, 200, -1) cv2.imshow('Contour 4', img4)

cv2.waitKey(0)