code sample for pandas-dev#42771

Author: simonjayhawkins

bisect/42771.py

@@ -0,0 +1,16 @@
+# BUG: DataFrame.drop() can't drop row by index tuple when MultiIndex has duplicated value in a level. #42771
+
+import pandas as pd
+
+print(pd.__version__)
+
+lev_0 = [1, 2]
+lev_1 = [1, 1]
+idx = pd.MultiIndex.from_product([lev_0, lev_1])
+df = pd.DataFrame(data={"a": range(0, len(idx))}, index=idx)
+
+result = df.drop(index=df.index[0])
+print(result)
+
+expected = df.iloc[-2:]
+pd.testing.assert_frame_equal(result, expected)