code: def dimension_sort(odict, kdims, vdims, key_index):
      sortkws = {}
      ndims = len(kdims)
      dimensions = kdims+vdims
      indexes = [(dimensions[i], int(i not in range(ndims)),
                      i if i in range(ndims) else i-ndims)
                  for i in key_index]
      cached_values = {d.name: [None]+list(d.values) for d in dimensions}
      if len(set(key_index)) != len(key_index):
          raise ValueError("Cannot sort on duplicated dimensions")
      else:
         sortkws['key'] = lambda x: tuple(cached_values[dim.name].index(x[t][d])
                                          if dim.values else x[t][d]
                                          for i, (dim, t, d) in enumerate(indexes))
      if sys.version_info.major == 3:
          return python2sort(odict.items(), **sortkws)
      else:
          return sorted(odict.items(), **sortkws)