code sample for pandas-dev#47128

Author: simonjayhawkins

bisect/47128.py

@@ -0,0 +1,14 @@
+# BUG: RangeIndex problem #47128
+
+import pandas as pd
+
+print(pd.__version__)
+
+A = pd.DataFrame({"a": [False, True]})  # index=[0,1] vs index=range(2)
+A["i"] = A.index
+A.loc[A["a"], "i"] = -2
+result = A.loc[A["a"], :]
+print(result)
+
+expected = pd.DataFrame({"a": True, "i": -2}, index=[1])
+pd.testing.assert_frame_equal(result, expected)