code sample for pandas-dev#42104

simonjayhawkins · simonjayhawkins · commit dd810a83f4dc · 2021-06-18T15:00:15.000+01:00
diff --git a/bisect/42104.py b/bisect/42104.py
@@ -0,0 +1,22 @@
+# BUG: DatetimeIndex.intersection gives incorrect result #42104
+
+import pandas as pd
+
+print(pd.__version__)
+
+index = pd.DatetimeIndex(
+    [
+        "2018-12-31",
+        "2019-03-31",
+        "2019-06-30",
+        "2019-09-30",
+        "2019-12-31",
+        "2020-03-31",
+    ],
+    freq="Q-DEC",
+)
+
+result = index[::2].intersection(index[1::2])
+print(result)
+
+assert not len(result)
