code: def banner(cls, content_="Well Come"):
          
          # char def
          sp_char = "#"
          # length calc
          itsays = content_.strip()
          effective_length = int(len(itsays))
          # gen contents
          side_space = ' ' * int(effective_length * ((1 - 0.618) / 0.618) / 2)
          content_line = sp_char + side_space + itsays + side_space + sp_char
          content_line_length = len(content_line)
          banner_border = sp_char * content_line_length
          return banner_border + '\n' + content_line + '\n' + banner_border
docs: 生成占3行的字符串