code: def parse(page_to_parse):
      
      global _parsed
      if not isinstance(page_to_parse, page.Page):
          raise TypeError("parser.parse requires a parker.Page object.")
  
      if page_to_parse.content is None:
          raise ValueError("parser.parse requires a fetched parker.Page object.")
  
      try:
          parsed = _parsed[page_to_parse]
      except KeyError:
          parsed = parsedpage.ParsedPage(
              page=page_to_parse,
              parsed=PyQuery(page_to_parse.content, parser='html')
          )
          _parsed[page_to_parse] = parsed
  
      return parsed
docs: Return a parse of page.content. Wraps PyQuery.