gh-114312: Collect stats for unlikely events (GH-114493)

1 files changed, 21 insertions, 1 deletions

diff --git a/Tools/scripts/summarize_stats.py b/Tools/scripts/summarize_stats.py
index 1e9dc07..9b7e7b9 100644
--- a/Tools/scripts/summarize_stats.py
+++ b/Tools/scripts/summarize_stats.py
@@ -412,6 +412,14 @@ class Stats:
         rows.sort()
         return rows
 
+    def get_rare_events(self) -> list[tuple[str, int]]:
+        prefix = "Rare event "
+        return [
+            (key[len(prefix) + 1:-1], val)
+            for key, val in self._data.items()
+            if key.startswith(prefix)
+        ]
+
 
 class Count(int):
     def markdown(self) -> str:
@@ -1064,6 +1072,17 @@ def optimization_section() -> Section:
     )
 
 
+def rare_event_section() -> Section:
+    def calc_rare_event_table(stats: Stats) -> Table:
+        return [(x, Count(y)) for x, y in stats.get_rare_events()]
+
+    return Section(
+        "Rare events",
+        "Counts of rare/unlikely events",
+        [Table(("Event", "Count:"), calc_rare_event_table, JoinMode.CHANGE)],
+    )
+
+
 def meta_stats_section() -> Section:
     def calc_rows(stats: Stats) -> Rows:
         return [("Number of data files", Count(stats.get("__nfiles__")))]
@@ -1085,6 +1104,7 @@ LAYOUT = [
     object_stats_section(),
     gc_stats_section(),
     optimization_section(),
+    rare_event_section(),
     meta_stats_section(),
 ]
 
@@ -1162,7 +1182,7 @@ def output_stats(inputs: list[Path], json_output=str | None):
         case 1:
             data = load_raw_data(Path(inputs[0]))
             if json_output is not None:
-                with open(json_output, 'w', encoding='utf-8') as f:
+                with open(json_output, "w", encoding="utf-8") as f:
                     save_raw_data(data, f)  # type: ignore
             stats = Stats(data)
             output_markdown(sys.stdout, LAYOUT, stats)