fix issue #21654

Author: elmq0022

doc/source/whatsnew/v0.24.0.txt

@@ -363,7 +363,7 @@ Missing
 MultiIndex
 ^^^^^^^^^^
 
--
+- Removing legacy MultiIndex internal formats
 -
 -
 

pandas/core/indexes/multi.py

@@ -1541,27 +1541,6 @@ def __reduce__(self):
                  sortorder=self.sortorder, names=list(self.names))
         return ibase._new_Index, (self.__class__, d), None
 
-    def __setstate__(self, state):
-        """Necessary for making this object picklable"""
-
-        if isinstance(state, dict):
-            levels = state.get('levels')
-            labels = state.get('labels')
-            sortorder = state.get('sortorder')
-            names = state.get('names')
-
-        elif isinstance(state, tuple):
-
-            nd_state, own_state = state
-            levels, labels, sortorder, names = own_state
-
-        self._set_levels([Index(x) for x in levels], validate=False)
-        self._set_labels(labels)
-        self._set_names(names)
-        self.sortorder = sortorder
-        self._verify_integrity()
-        self._reset_identity()
-
     def __getitem__(self, key):
         if is_scalar(key):
             retval = []

pandas/tests/indexes/multi/data/mindex_073.pickle

@@ -4,10 +4,8 @@
 import numpy as np
 import pandas as pd
 import pandas.util.testing as tm
-import pytest
 from pandas import DataFrame, MultiIndex, date_range
-from pandas.compat import PY3, range
-from pandas.util.testing import assert_almost_equal
+from pandas.compat import range
 
 
 def test_tolist(idx):
@@ -93,46 +91,6 @@ def test_to_hierarchical():
     assert result.names == index.names
 
 
-@pytest.mark.skipif(PY3, reason="testing legacy pickles not support on py3")
-def test_legacy_pickle(datapath):
-
-    path = datapath('indexes', 'multi', 'data', 'multiindex_v1.pickle')
-    obj = pd.read_pickle(path)
-
-    obj2 = MultiIndex.from_tuples(obj.values)
-    assert obj.equals(obj2)
-
-    res = obj.get_indexer(obj)
-    exp = np.arange(len(obj), dtype=np.intp)
-    assert_almost_equal(res, exp)
-
-    res = obj.get_indexer(obj2[::-1])
-    exp = obj.get_indexer(obj[::-1])
-    exp2 = obj2.get_indexer(obj2[::-1])
-    assert_almost_equal(res, exp)
-    assert_almost_equal(exp, exp2)
-
-
-def test_legacy_v2_unpickle(datapath):
-
-    # 0.7.3 -> 0.8.0 format manage
-    path = datapath('indexes', 'multi', 'data', 'mindex_073.pickle')
-    obj = pd.read_pickle(path)
-
-    obj2 = MultiIndex.from_tuples(obj.values)
-    assert obj.equals(obj2)
-
-    res = obj.get_indexer(obj)
-    exp = np.arange(len(obj), dtype=np.intp)
-    assert_almost_equal(res, exp)
-
-    res = obj.get_indexer(obj2[::-1])
-    exp = obj.get_indexer(obj[::-1])
-    exp2 = obj2.get_indexer(obj2[::-1])
-    assert_almost_equal(res, exp)
-    assert_almost_equal(exp, exp2)
-
-
 def test_roundtrip_pickle_with_tz():
 
     # GH 8367
@@ -146,6 +104,7 @@ def test_roundtrip_pickle_with_tz():
 
 
 def test_pickle(indices):
+
     unpickled = tm.round_trip_pickle(indices)
     assert indices.equals(unpickled)
     original_name, indices.name = indices.name, 'foo'