code: 
  
  
  
  
  
  '''simple docstring'''
  
  
  
  
  
  import numpy as np
  from cva import destroyAllWindows, imread, imshow, waitKey
  
  
  
  
  
  
  class 						lowercase     :
  
  
  
  
  
  
        def __init__(self ,  a__ ,  a__					)       ->   Optional[int]:
           SCREAMING_SNAKE_CASE__			:				Optional[int]       						= 0
           # max greyscale value for #FFFFFF
           SCREAMING_SNAKE_CASE__			:				Tuple       						= int(self.get_greyscale(2_5_5 ,  2_5_5 ,  2_5_5					)					)
  
           if not self.min_threshold < threshold < self.max_threshold:
              SCREAMING_SNAKE_CASE__			:				List[Any]       						= f"""Factor value should be from 0 to {self.max_threshold}"""
              raise ValueError(__a					)
  
           SCREAMING_SNAKE_CASE__			:				Optional[int]       						= input_img
           SCREAMING_SNAKE_CASE__			:				str       						= threshold
           SCREAMING_SNAKE_CASE__			:				Any       						= self.input_img.shape[1], self.input_img.shape[0]
  
           # error table size (+4 columns and +1 row) greater than input image because of
           # lack of if statements
           SCREAMING_SNAKE_CASE__			:				Dict       						= [
               [0 for _ in range(self.height + 4					)] for __ in range(self.width + 1					)
           ]
           SCREAMING_SNAKE_CASE__			:				str       						= np.ones((self.width, self.height, 3) ,  np.uinta					) * 2_5_5
  
  
  
  
  
  
        @classmethod
        def    A__(cls ,  a__ ,  a__ ,  a__					)       ->   Union[str, Any]:
           return 0.1_14 * blue + 0.5_87 * green + 0.21_26 * red
  
  
  
  
  
  
        def    A__(self					)       ->   Optional[Any]:
  
  
  
  
  
           for y in range(self.height					):
              for x in range(self.width					):
                 SCREAMING_SNAKE_CASE__			:				Optional[int]       						= int(self.get_greyscale(*self.input_img[y][x]					)					)
                 if self.threshold > greyscale + self.error_table[y][x]:
                    SCREAMING_SNAKE_CASE__			:				Tuple       						= (0, 0, 0)
                    SCREAMING_SNAKE_CASE__			:				List[Any]       						= greyscale + self.error_table[x][y]
                 else:
                    SCREAMING_SNAKE_CASE__			:				Dict       						= (2_5_5, 2_5_5, 2_5_5)
                    SCREAMING_SNAKE_CASE__			:				Tuple       						= greyscale + self.error_table[x][y] - 2_5_5
                 self.error_table[y][x + 1] += int(8 / 3_2 * current_error					)
                 self.error_table[y][x + 2] += int(4 / 3_2 * current_error					)
                 self.error_table[y + 1][x] += int(8 / 3_2 * current_error					)
                 self.error_table[y + 1][x + 1] += int(4 / 3_2 * current_error					)
                 self.error_table[y + 1][x + 2] += int(2 / 3_2 * current_error					)
                 self.error_table[y + 1][x - 1] += int(4 / 3_2 * current_error					)
                 self.error_table[y + 1][x - 2] += int(2 / 3_2 * current_error					)
  
  
  if __name__ == "__main__":
         # create Burke's instances with original images in greyscale
         lowercase__			=	[
             Burkes(imread('''image_data/lena.jpg''', 1), threshold)
             for threshold in (1, 1_2_6, 1_3_0, 1_4_0)
         ]
  
         for burkes in burkes_instances:
                burkes.process()
  
         for burkes in burkes_instances:
                imshow(
                    F"Original image with dithering threshold: {burkes.threshold}",
                    burkes.output_img,
                )
  
         waitKey(0)
         destroyAllWindows()
  
  
style_context: 
  
  
  
  
  '''simple docstring'''
  
  
  
  
  
  from __future__ import annotations
  
  import sys
  
  
  
  
  
  
  class 						lowercase     :
  
  
  
  
  
  
        def __init__(self ,  a__ ,  a__					)       ->   List[str]:
           SCREAMING_SNAKE_CASE__			:				str       						= letter
           SCREAMING_SNAKE_CASE__			:				int       						= freq
           SCREAMING_SNAKE_CASE__			:				dict[str, str]       						= {}
  
  
  
  
  
  
        def __repr__(self					)       ->   str:
           return f"""{self.letter}:{self.freq}"""
  
  
  
  
  
  
  class 						lowercase     :
  
  
  
  
  
  
        def __init__(self ,  a__ ,  a__ ,  a__					)       ->   Union[str, Any]:
           SCREAMING_SNAKE_CASE__			:				int       						= freq
           SCREAMING_SNAKE_CASE__			:				Letter | TreeNode       						= left
           SCREAMING_SNAKE_CASE__			:				Letter | TreeNode       						= right
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				dict[str, int]       						= {}
     with open(snake_case   ) as f:
        while True:
           SCREAMING_SNAKE_CASE__			:				List[str]       						= f.read(1   )
           if not c:
              break
           SCREAMING_SNAKE_CASE__			:				Optional[Any]       						= chars[c] + 1 if c in chars else 1
     return sorted((Letter(snake_case	,     snake_case   ) for c, f in chars.items())	,     key=lambda snake_case   : x.freq   )
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				list[Letter | TreeNode]       						= letters  # type: ignore
     while len(snake_case   ) > 1:
        SCREAMING_SNAKE_CASE__			:				Optional[Any]       						= response.pop(0   )
        SCREAMING_SNAKE_CASE__			:				Union[str, Any]       						= response.pop(0   )
        SCREAMING_SNAKE_CASE__			:				Dict       						= left.freq + right.freq
        SCREAMING_SNAKE_CASE__			:				Any       						= TreeNode(snake_case	,     snake_case	,     snake_case   )
        response.append(snake_case   )
        response.sort(key=lambda snake_case   : x.freq   )
     return response[0]
  
  
  def 				UpperCamelCase	(  snake_case	,     snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     if isinstance(snake_case	,     snake_case   ):
        SCREAMING_SNAKE_CASE__			:				Optional[int]       						= bitstring
        return [root]
     SCREAMING_SNAKE_CASE__			:				TreeNode       						= root  # type: ignore
     SCREAMING_SNAKE_CASE__			:				int       						= []
     letters += traverse_tree(treenode.left	,     bitstring + '''0'''   )
     letters += traverse_tree(treenode.right	,     bitstring + '''1'''   )
     return letters
  
  
  def 				UpperCamelCase	(  snake_case   ):
  
  
  
  
     '''simple docstring'''
  
     SCREAMING_SNAKE_CASE__			:				Optional[int]       						= parse_file(snake_case   )
     SCREAMING_SNAKE_CASE__			:				List[Any]       						= build_tree(snake_case   )
     SCREAMING_SNAKE_CASE__			:				List[str]       						= {
         k: v for letter in traverse_tree(snake_case	,     ''''''   ) for k, v in letter.bitstring.items()
     }
     print(f"""Huffman Coding  of {file_path}: """   )
     with open(snake_case   ) as f:
        while True:
           SCREAMING_SNAKE_CASE__			:				Tuple       						= f.read(1   )
           if not c:
              break
           print(letters[c]	,     end=''' '''   )
     print()
  
  
  if __name__ == "__main__":
         # pass the file path to the huffman function
         huffman(sys.argv[1])
  
  