code: def convert_pre(self, markup):
          
          
          
          for m in re.findall(self.re["preformatted"], markup):
              markup = markup.replace(m, m.replace("\n", "\n "))
              markup = re.sub("<pre.*?>\n{0,}", "", markup)
              markup = re.sub("\W{0,}</pre>", "", markup)
          
          return markup
docs: Substitutes <pre> to Wikipedia markup by adding a space at the start of a line.