code: def prepare(self, request):
          
  
          data = []
          for conv in self.conversions:
              data.append(conv.prepare(request))
  
          return data
docs: Performs any preparations necessary for the Format.
  
          :param request: The webob Request object describing the
                          request.
  
          :returns: A list of dictionary values needed by the convert()
                    method.