code sample for pandas-dev#39636

Author: simonjayhawkins

bisect/39636.py

@@ -0,0 +1,13 @@
+import pandas as pd
+import pandas.testing as tm
+
+print(pd.__version__)
+
+df = pd.DataFrame([], columns=["id", "field"])
+
+result = df["id"].transform(lambda x: x + 10)
+print(result)
+
+expected = pd.Series([], index=pd.Index([], dtype="object"), name="id", dtype="object")
+
+tm.assert_series_equal(result, expected)