input: 
  def generate_pattern() -> None:
      """ Generate a pattern of '#' and ' ' based on the condition that (i + j) is even.
      >>> generate_pattern()
      ##  ##  ##
       ##  ##  #
      ##  ##  ##
       ##  ##  #
      ##  ##  ##
       ##  ##  #
      ##  ##  ##
      """
  
output:     for i in range(7):
          for j in range(13):
              if (i + j) % 2 == 0:
                  print('#', end='')
              else:
                  print(' ', end='')
          print()