code sample for pandas-dev#42380

Author: simonjayhawkins

bisect/42380.py

@@ -0,0 +1,14 @@
+import pandas as pd
+
+print(pd.__version__)
+
+
+df = pd.DataFrame(
+    {"a": list("abcde"), "b": list("abcde")}, index=list("aabbc"), dtype="category"
+)
+
+result = df.agg("-".join, axis=1)
+print(result)
+
+expected = pd.Series(["a-a", "b-b", "c-c", "d-d", "e-e"], index=list("aabbc"))
+pd.testing.assert_series_equal(result, expected)