how to display img in cv2 code example

Example 1: cv show image python

cv2.imshow('image',img)
cv2.waitKey(0)

Example 2: cv2 load image

import numpy as np
    import cv2
    import matplotlib.pyplot as plt
    %matplotlib inline # if you are running this code in jupyter notebook

    img = cv2.imread('/path_to_image/opencv-logo.png',0) # reads image 'opencv-logo.png' as grayscale
    plt.imshow(img, cmap='gray')