input: 
  def print_chessboard_pattern():
      """
      Prints a chessboard pattern with 7x7 grid, using '#' for one color and empty spaces for the other.
  
      Example Output:
      # # # 
       # # #
      # # # 
       # # #
      # # # 
       # # #
      # # #
      """
      for i in range(7):
          for j in range(7):
              if (i + j) % 2 == 0:
                  print('#', end='')
              else:
                  print(' ', end='')
          print()
  
output:     for i in range(7):
          for j in range(7):
              if (i + j) % 2 == 0:
                  print('#', end='')
              else:
                  print(' ', end='')
          print()