[Python] can not extract persian/farsi text from image in python using pytesseract

I'm using pytesseract for extracting Persian text from the image but I get nothing! I downloaded fas.traineddata and put it in tessdata but still not working!

here is my code

import cv2
import pytesseract
from unidecode import unidecode

pytesseract.pytesseract.tesseract_cmd = 'D:\\New folder\\tesseract.exe'
img = cv2.imread('B.png')

text = pytesseract.image_to_string(img , lang='fas')

print(text)




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