I want to import an image in Python but I can't solve the error I work on pycharm

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Python2.2

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I'm a beginner to python and tried to import an image to my IDE but there is an error, I worked on the error for more than three hours but in vain could some one help me with this error, please?

What I have tried:

#Created by AyaNabil on 26/9/2022

    #importing packages

        import cv2
        import numpy as np
        import matplotlib.pyplot as plt
        
        # load the Image
        
        def read_file(filename):
            img = cv2.imread(filename)
            img = cv2.cvColor(img, cv2.COLOR_BGR2RGB)
            plt.imshow(img)
            plt.show()
            return img
        
        #image path 
        filename = "C:\Users\Dell Latitude E5570\OneDrive - Alexandria University\Desktop\500x500.jpg"
        
        read_file(filename)

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