code: def get_or_create_exh_obj(full_cname=False, exclude=None, callables_fname=None):
      r
      if not hasattr(__builtin__, "_EXH"):
          set_exh_obj(
              ExHandle(
                  full_cname=full_cname, exclude=exclude, callables_fname=callables_fname
              )
          )
      return get_exh_obj()