docs: def clusters_sites_obj(clusters):
      """Get all the corresponding sites of the passed clusters.
  
      Args:
          clusters(list): list of string uid of sites (e.g 'rennes')
  
      Return:
          dict corresponding to the mapping cluster uid to python-grid5000 site
      """
      result = {}
      all_clusters = get_all_clusters_sites()
      clusters_sites = {c: s for (c, s) in all_clusters.items()
                          if c in clusters}
      for cluster, site in clusters_sites.items():
  
          # here we want the site python-grid5000 site object
          result.update({cluster: get_site_obj(site)})
      return result