code: def _read_uaa_cache(self):
          
          self._cache_path = os.path.expanduser('~/.predix/uaa.json')
          if not os.path.exists(self._cache_path):
              return self._initialize_uaa_cache()
  
          with open(self._cache_path, 'r') as data:
              return json.load(data)
docs: Read cache of UAA client/user details.