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include before/after examples
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doc/source/whatsnew/v1.1.0.rst

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@@ -188,17 +188,61 @@ MultiIndex
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left.intersection(right, sort=False)
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- Bug in :meth:`MultiIndex.get_indexer` incorrectly handling use of pad and backfill options (:issue:`29896`)
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.. ipython:: python
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df = pd.DataFrame({
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'a': [0, 0, 0, 0],
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'b': [0, 2, 3, 4],
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'c': ['A', 'B', 'C', 'D']
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}).set_index(['a', 'b'])
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mi_2 = pd.MultiIndex.from_product([[0], [-1, 0, 1, 3, 4, 5]])
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*pandas [0.23.0, 1.1.0)*
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.. code-block:: python
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>>> df = pd.DataFrame({
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... 'a': [0, 0, 0, 0],
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... 'b': [0, 2, 3, 4],
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... 'c': ['A', 'B', 'C', 'D'],
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... }).set_index(['a', 'b'])
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>>> mi_2 = pd.MultiIndex.from_product([[0], [-1, 0, 1, 3, 4, 5]])
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>>>
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>>> df.reindex(mi_2, method="backfill")
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c
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0 -1 A
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0 A
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1 D
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3 A
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4 A
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5 C
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>>>
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>>> df.reindex(mi_2, method="pad")
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c
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0 -1 NaN
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0 NaN
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1 D
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3 NaN
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4 A
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5 C
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*pandas 1.1.0*:
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.. code-block:: python
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>>> df = pd.DataFrame({
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... 'a': [0, 0, 0, 0],
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... 'b': [0, 2, 3, 4],
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... 'c': ['A', 'B', 'C', 'D'],
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... }).set_index(['a', 'b'])
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>>> mi_2 = pd.MultiIndex.from_product([[0], [-1, 0, 1, 3, 4, 5]])
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>>>
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>>> df.reindex(mi_2, method="backfill")
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c
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0 -1 A
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0 A
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1 B
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3 C
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4 D
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5 NaN
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>>>
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>>> df.reindex(mi_2, method="pad")
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c
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0 -1 NaN
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0 A
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1 A
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3 C
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4 D
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5 D
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>>>
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df.reindex(mi_2, method='backfill')
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df.reindex(mi_2, method='pad')
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-
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I/O

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