code: def acquire(cls, name=None, lifetime=None, mechs=None, usage='both',
                  store=None):
          if store is None:
              res = rcreds.acquire_cred(name, lifetime,
                                        mechs, usage)
          else:
              if rcred_cred_store is None:
                  raise NotImplementedError("Your GSSAPI implementation does "
                                            "not have support for manipulating "
                                            "credential stores")
              store = _encode_dict(store)
              res = rcred_cred_store.acquire_cred_from(store, name,
                                                       lifetime, mechs,
                                                       usage)
          return tuples.AcquireCredResult(cls(base=res.creds), res.mechs,
                                          res.lifetime)