docs: def save_to_cache(dxobject):
      '''
      :param dxobject: a dxpy object handler for an object to save to the cache
      :raises: :exc:`~dxpy.exceptions.DXError` if this is called with dxpy.JOB_ID not set, or if "DX_PROJECT_CACHE_ID" is not found in the environment variables
  
      Clones the given object to the project cache.
  
      Example::
  
          @dxpy.entry_point('main')
          def main(*args, **kwargs):
              x = load_from_cache(name="Indexed genome", classname='file')
              if x is None:
                  x = compute_result(*args)
                  save_to_cache(x)
      '''
  
      if dxpy.JOB_ID is None:
          raise DXError('Not called by a job')
      if 'DX_PROJECT_CACHE_ID' not in os.environ:
          raise DXError('Project cache ID could not be found in the environment variable DX_PROJECT_CACHE_ID')
  
      dxobject.clone(os.environ.get('DX_PROJECT_CACHE_ID'))