Add another example (event count per dataset)

python/examples/map_count_events_per_dataset.py

@@ -0,0 +1,25 @@
+import undr
+
+
+def handle_dvs(file: undr.DvsFile, send_message: undr.SendMessage):
+    file_total = 0
+    for packet in file.packets():
+        file_total += len(packet)
+    send_message(
+        {
+            "dataset_name": file.path_id.parts[0],
+            "file_total": file_total,
+        }
+    )
+
+
+if __name__ == "__main__":
+    configuration = undr.configuration_from_path("undr.toml")
+    dataset_name_to_total = {
+        dataset_name: 0
+        for dataset_name in configuration.name_to_dataset_settings.keys()
+    }
+    for message in configuration.map(switch=undr.Switch(handle_dvs=handle_dvs)):
+        dataset_name_to_total[message["dataset_name"]] += message["file_total"]
+    for dataset_name, total in dataset_name_to_total:
+        print(f"{dataset_name}: {total}")