code: def requires_multifile(self):
          
          if (self.max_sitemap_entries is None or
                  len(self) <= self.max_sitemap_entries):
              return(False)
          return(int(math.ceil(len(self) / float(self.max_sitemap_entries))))
docs: Return False or the number of component sitemaps required.
  
          In the case that no len() is available for self.resources then
          then self.count must be set beforehand to avoid an exception.