code sample for pandas-dev#42905

Author: simonjayhawkins

bisect/42905.py

@@ -0,0 +1,65 @@
+# BUG: Using agg on a resampled SeriesGroupBy exits Python without traceback #42905
+
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame(
+    {
+        "class": {
+            0: "beta",
+            1: "alpha",
+            2: "alpha",
+            3: "gaga",
+            4: "beta",
+            5: "gaga",
+            6: "beta",
+            7: "gaga",
+            8: "beta",
+            9: "gaga",
+            10: "alpha",
+            11: "beta",
+            12: "alpha",
+            13: "gaga",
+            14: "alpha",
+        },
+        "value": {
+            0: 69,
+            1: 33,
+            2: 40,
+            3: 2,
+            4: 36,
+            5: 40,
+            6: 48,
+            7: 84,
+            8: 77,
+            9: 22,
+            10: 55,
+            11: 82,
+            12: 37,
+            13: 88,
+            14: 41,
+        },
+        "date": {
+            0: pd.Timestamp("2021-02-28 00:00:00"),
+            1: pd.Timestamp("2021-11-30 00:00:00"),
+            2: pd.Timestamp("2021-02-28 00:00:00"),
+            3: pd.Timestamp("2021-04-30 00:00:00"),
+            4: pd.Timestamp("2021-02-28 00:00:00"),
+            5: pd.Timestamp("2021-04-30 00:00:00"),
+            6: pd.Timestamp("2021-07-31 00:00:00"),
+            7: pd.Timestamp("2021-01-31 00:00:00"),
+            8: pd.Timestamp("2021-01-31 00:00:00"),
+            9: pd.Timestamp("2021-01-31 00:00:00"),
+            10: pd.Timestamp("2021-04-30 00:00:00"),
+            11: pd.Timestamp("2021-10-31 00:00:00"),
+            12: pd.Timestamp("2021-09-30 00:00:00"),
+            13: pd.Timestamp("2021-04-30 00:00:00"),
+            14: pd.Timestamp("2021-05-31 00:00:00"),
+        },
+    }
+)
+
+grp = df.set_index("date").groupby("class")
+result = grp.resample("M")["value"].agg(["sum", "size"])
+print(result)