add code sample for pandas-dev#38509

Author: simonjayhawkins

bisect/38509.py

@@ -0,0 +1,13 @@
+import pandas as pd
+import pandas.testing as tm
+
+print(pd.__version__)
+
+tdi = pd.timedelta_range("1 Day", periods=3)
+ser = pd.Series(tdi)
+result = ser.astype("string")
+print(result)
+
+expected = pd.Series(["1 days", "2 days", "3 days"], dtype="string")
+
+tm.assert_series_equal(result, expected)