code: def subscriptlist(self, subscripts):
          
          if len(subscripts) == 1:
              return ast.Subscript(slice=subscripts[0], ctx=None, loc=None)
          elif all([isinstance(x, ast.Index) for x in subscripts]):
              elts  = [x.value for x in subscripts]
              loc   = subscripts[0].loc.join(subscripts[-1].loc)
              index = ast.Index(value=ast.Tuple(elts=elts, ctx=None,
                                                begin_loc=None, end_loc=None, loc=loc),
                                loc=loc)
              return ast.Subscript(slice=index, ctx=None, loc=None)
          else:
              extslice = ast.ExtSlice(dims=subscripts,
                                      loc=subscripts[0].loc.join(subscripts[-1].loc))
              return ast.Subscript(slice=extslice, ctx=None, loc=None)
docs: subscriptlist: subscript (',' subscript)* [',']