input: 
  def print_chessboard_pattern():
      """Prints a chessboard pattern with dimensions 7x7, where '#' represents
      the dark squares and ' ' represents the light squares.
      
      >>> print_chessboard_pattern()
      # # # # # 
       # # # # #
      # # # # # 
       # # # # #
      # # # # # 
       # # # # #
      # # # # # 
      """
  
output:     for i in range(7):
          if i % 2 == 0:
              print("# " * 4)
          else:
              print(" #" * 4)