code: def map_pixels_to_ascii_chars(image, range_width=25):
      
  
      pixels_in_image = list(image.getdata())
      pixels_to_chars = [ASCII_CHARS[pixel_value/range_width] for pixel_value in
              pixels_in_image]
  
      return "".join(pixels_to_chars)
docs: Maps each pixel to an ascii char based on the range
      in which it lies.
  
      0-255 is divided into 11 ranges of 25 pixels each.