code: def find_module(self, fullname, path=None):
          
          root, base, target = fullname.partition(self.root_name + '.')
          if root:
              return
          if not any(map(target.startswith, self.vendored_names)):
              return
          return self
docs: Return self when fullname starts with root_name and the
          target module is one vendored through this importer.