code sample for pandas-dev#44924

Author: simonjayhawkins

bisect/44924.py

@@ -0,0 +1,18 @@
+# BUG: misleading error message when aggregating duplicate column names in groupby #44924
+
+import pandas as pd
+
+print(pd.__version__)
+
+grp = pd.DataFrame.from_dict(
+    {
+        "A": [1, 2],
+        "B": [3, 3],
+        "C": ["G", "G"],
+    }
+).groupby("C")
+
+print([i for i in grp])
+
+grp2 = grp[["A", "B", "A"]]
+print(grp2.mean())