code sample for pandas-dev#43568

Author: simonjayhawkins

bisect/43568.py

@@ -0,0 +1,12 @@
+# REGR: change in output of groupby.apply in 1.3.2 -> 1.3.3 #43568
+
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd._testing.makeTimeDataFrame()
+
+result = df.groupby(df.index.month).apply(lambda x: x.drop_duplicates())
+print(result)
+
+assert isinstance(result.index, pd.MultiIndex)