code sample for pandas-dev#40018

Author: simonjayhawkins

bisect/40018.py

@@ -0,0 +1,15 @@
+import pandas as pd
+import pandas.testing as tm
+
+print(pd.__version__)
+
+df = pd.DataFrame({"a": [1, 2], "b": [1, 4], "c": [1, 4]})
+
+res = df.transform({"b": ["sqrt", "abs"], "c": "sqrt"})
+print(res)
+
+expected = pd.MultiIndex.from_tuples(
+    [("b", "sqrt"), ("b", "abs"), ("c", "sqrt")],
+)
+
+tm.assert_index_equal(res.columns, expected)