Add salt and pepper noise to images

salt_pepper_noise_images.py

def add_salt_pepper_noise(X_imgs):
    # Need to produce a copy as to not modify the original image
    X_imgs_copy = X_imgs.copy()
    row, col, _ = X_imgs_copy[0].shape
    salt_vs_pepper = 0.2
    amount = 0.004
    num_salt = np.ceil(amount * X_imgs_copy[0].size * salt_vs_pepper)
    num_pepper = np.ceil(amount * X_imgs_copy[0].size * (1.0 - salt_vs_pepper))
    
    for X_img in X_imgs_copy:
        # Add Salt noise
        coords = [np.random.randint(0, i - 1, int(num_salt)) for i in X_img.shape]
        X_img[coords[0], coords[1], :] = 1

        # Add Pepper noise
        coords = [np.random.randint(0, i - 1, int(num_pepper)) for i in X_img.shape]
        X_img[coords[0], coords[1], :] = 0
    return X_imgs_copy
  
salt_pepper_noise_imgs = add_salt_pepper_noise(X_imgs)

AttributeError: 'str' object has no attribute 'copy'

from copy import deepcopy

then you can do X_imgs_copy = deepcopy(X_imgs)