code sample for pandas-dev#47596

Author: simonjayhawkins

bisect/47596.py

@@ -0,0 +1,19 @@
+# BUG: Inconsistent handling of dropping levels in MultiIndex when using IndexSlice #47596
+
+import pandas as pd
+
+print(pd.__version__)
+
+idx = pd.IndexSlice
+df = pd.DataFrame(
+    index=pd.MultiIndex.from_product([["A", "B"], range(2), ["a", "b"]]),
+    columns=pd.MultiIndex.from_product([["a", "b"], range(2)]),
+)
+result = df.loc[idx["A", :, :]]
+print(result)
+
+expected = pd.DataFrame(
+    index=pd.MultiIndex.from_product([["A"], range(2), ["a", "b"]]),
+    columns=pd.MultiIndex.from_product([["a", "b"], range(2)]),
+)
+pd.testing.assert_frame_equal(result, expected)