code: def markdown(self, text, mode='', context='', raw=False):
          
          data = None
          json = False
          headers = {}
          if raw:
              url = self._build_url('markdown', 'raw')
              data = text
              headers['content-type'] = 'text/plain'
          else:
              url = self._build_url('markdown')
              data = {}
  
              if text:
                  data['text'] = text
  
              if mode in ('markdown', 'gfm'):
                  data['mode'] = mode
  
              if context:
                  data['context'] = context
              json = True
  
          if data:
              req = self._post(url, data=data, json=json, headers=headers)
              if req.ok:
                  return req.content
          return ''
docs: Render an arbitrary markdown document.
  
          :param str text: (required), the text of the document to render
          :param str mode: (optional), 'markdown' or 'gfm'
          :param str context: (optional), only important when using mode 'gfm',
              this is the repository to use as the context for the rendering
          :param bool raw: (optional), renders a document like a README.md, no
              gfm, no context
          :returns: str -- HTML formatted text