



from __future__ import annotations

a_    :  str						  =		list[list[int]]

# assigning initial values to the grid
a_    :  Matrix						  =		[
    [3, 0, 6, 5, 0, 8, 4, 0, 0],
    [5, 2, 0, 0, 0, 0, 0, 0, 0],
    [0, 8, 7, 0, 0, 0, 0, 3, 1],
    [0, 0, 3, 0, 1, 0, 0, 8, 0],
    [9, 0, 0, 8, 6, 3, 0, 0, 5],
    [0, 5, 0, 0, 9, 0, 6, 0, 0],
    [1, 3, 0, 0, 0, 0, 2, 5, 0],
    [0, 0, 0, 0, 0, 0, 0, 7, 4],
    [0, 0, 5, 2, 0, 6, 3, 0, 0],
]

# a grid with no solution
a_    :  Matrix						  =		[
    [5, 0, 6, 5, 0, 8, 4, 0, 3],
    [5, 2, 0, 0, 0, 0, 0, 0, 2],
    [1, 8, 7, 0, 0, 0, 0, 3, 1],
    [0, 0, 3, 0, 1, 0, 0, 8, 0],
    [9, 0, 0, 8, 6, 3, 0, 0, 5],
    [0, 5, 0, 0, 9, 0, 6, 0, 0],
    [1, 3, 0, 0, 0, 0, 2, 5, 0],
    [0, 0, 0, 0, 0, 0, 0, 7, 4],
    [0, 0, 5, 2, 0, 6, 3, 0, 0],
]

def      __lowercase(						UpperCAmelCase__ , UpperCAmelCase__ , UpperCAmelCase__ , UpperCAmelCase__			):


      """simple docstring"""



      for i in range(9			):
            if grid[row][i] == n or grid[i][column] == n:
                  return False

      for i in range(3			):
            for j in range(3			):
                  if grid[(row - row % 3) + i][(column - column % 3) + j] == n:
                        return False

      return True

def      __lowercase(						UpperCAmelCase__			):


      """simple docstring"""



      for i in range(9			):
            for j in range(9			):
                  if grid[i][j] == 0:
                        return i, j
      return None

def      __lowercase(						UpperCAmelCase__			):


      """simple docstring"""



      if location := find_empty_location(UpperCAmelCase__			):
            lowerCamelCase      ,				lowerCamelCase             =		location
      else:
            # If the location is ``None``, then the grid is solved.
            return grid

      for digit in range(1 , 10			):
            if is_safe(UpperCAmelCase__ , UpperCAmelCase__ , UpperCAmelCase__ , UpperCAmelCase__			):
                  lowerCamelCase             =		digit

                  if sudoku(UpperCAmelCase__			) is not None:
                        return grid

                  lowerCamelCase             =		0

      return None

def      __lowercase(						UpperCAmelCase__			):


      """simple docstring"""



      for row in grid:
            for cell in row:
                  print(UpperCAmelCase__ , end=" "			)
            print()


if __name__ == "__main__":
     # make a copy of grid so that you can compare with the unmodified grid
     for example_grid in (initial_grid, no_solution):
          print('\nExample grid:\n' + '=' * 2_0)
          print_solution(example_grid)
          print('\nExample grid solution:')
          a_    :  List[Any]						  =		sudoku(example_grid)
          if solution is not None:
               print_solution(solution)
          else:
               print('Cannot find a solution.')




import socket

def      __lowercase(						):


      """simple docstring"""



      lowerCamelCase             =		socket.socket(socket.AF_INET , socket.SOCK_STREAM			)
      lowerCamelCase             =		socket.gethostname()
      lowerCamelCase             =		12312

      sock.connect((host, port)			)
      sock.send(B"Hello server!"			)

      with open("Received_file" , "wb"			) as out_file:
            print("File opened"			)
            print("Receiving data..."			)
            while True:
                  lowerCamelCase             =		sock.recv(1024			)
                  if not data:
                        break
                  out_file.write(UpperCAmelCase__			)

      print("Successfully received the file"			)
      sock.close()
      print("Connection closed"			)


if __name__ == "__main__":
     main()