code: def load(self, path):
          
          path = os.path.normpath(path)
          mtime = os.stat(path).st_mtime
  
          if path not in self or self[path].mtime != mtime:
              manifest = self.build(path)
              self[path] = self.manifest_mod(manifest, mtime)
  
          return self[path].manifest
docs: Load a manifest at path or return a suitable manifest already loaded.