code sample for pandas-dev#43091

Author: simonjayhawkins

bisect/43091.py

@@ -0,0 +1,32 @@
+# BUG: Change of behavior in casting of datetime-like types in MultiIndex #43091
+
+import datetime
+
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame(
+    {
+        "date": [
+            datetime.date(2021, 8, 1),
+            datetime.date(2021, 8, 2),
+            datetime.date(2021, 8, 3),
+        ],
+        "ticker": ["aapl", "goog", "yhoo"],
+        "value": [5.63269, 4.45609, 2.74843],
+    }
+)
+df.set_index(["date", "ticker"], inplace=True)
+
+result = df.index.get_level_values(0)
+print(result)
+
+expected = pd.DatetimeIndex(
+    ["2021-08-01", "2021-08-02", "2021-08-03"],
+    dtype="datetime64[ns]",
+    name="date",
+    freq=None,
+)
+
+pd._testing.assert_index_equal(result, expected)