code: def clusters(self):
          
          if not hasattr(self, "_clusters"):
              cs = {}
              for cr in self.doc["clusters"]:
                  cs[cr["name"]] = c = copy.deepcopy(cr["cluster"])
                  if "server" not in c:
                      c["server"] = "http://localhost"
                  BytesOrFile.maybe_set(c, "certificate-authority")
              self._clusters = cs
          return self._clusters
docs: Returns known clusters by exposing as a read-only property.