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Try this. It it working.

import cv2

# Read image
im = cv2.imread("cow.jpg")

# Edge preserving filter with two different flags.
imout = cv2.edgePreservingFilter(im, flags=cv2.RECURS_FILTER)
cv2.imwrite("edge-preserving-recursive-filter.jpg", imout)

imout = cv2.edgePreservingFilter(im, flags=cv2.NORMCONV_FILTER)
cv2.imwrite("edge-preserving-normalized-convolution-filter.jpg", imout)

# Detail enhance filter
imout = cv2.detailEnhance(im)
cv2.imwrite("detail-enhance.jpg", imout)

# Pencil sketch filter
imout_gray, imout = cv2.pencilSketch(im, sigma_s=60, sigma_r=0.07, shade_factor=0.05)
cv2.imwrite("pencil-sketch.jpg", imout_gray)
cv2.imwrite("pencil-sketch-color.jpg", imout)

# Stylization filter
cv2.stylization(im,imout)
cv2.imwrite("stylization.jpg", imout)