python-sdk: split stream and control examples (2026-03-16)

- make 03_turn_stream_events a clean streaming example with curated event output
- add 14_turn_controls as a separate steer and interrupt demo with concise summaries
- update the notebook and runtime-backed example assertions to match the new example shapes

Co-authored-by: Codex <noreply@openai.com>

sdk/python/examples/03_turn_stream_events/sync.py

@@ -5,7 +5,12 @@ _EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
 if str(_EXAMPLES_ROOT) not in sys.path:
     sys.path.insert(0, str(_EXAMPLES_ROOT))
 
-from _bootstrap import ensure_local_sdk_src, runtime_config
+from _bootstrap import (
+    assistant_text_from_turn,
+    ensure_local_sdk_src,
+    find_turn_by_id,
+    runtime_config,
+)
 
 ensure_local_sdk_src()
 
@@ -13,24 +18,38 @@ from codex_app_server import Codex, TextInput
 
 with Codex(config=runtime_config()) as codex:
     thread = codex.thread_start(model="gpt-5.4", config={"model_reasoning_effort": "high"})
-    turn = thread.turn(TextInput("Count from 1 to 200 with commas, then one summary sentence."))
-
-    # Best effort controls: models can finish quickly, so races are expected.
-    try:
-        _ = turn.steer(TextInput("Keep it brief and stop after 20 numbers."))
-        print("steer: sent")
-    except Exception as exc:
-        print("steer: skipped", type(exc).__name__)
-
-    try:
-        _ = turn.interrupt()
-        print("interrupt: sent")
-    except Exception as exc:
-        print("interrupt: skipped", type(exc).__name__)
+    turn = thread.turn(TextInput("Explain SIMD in 3 short bullets."))
 
     event_count = 0
+    saw_started = False
+    saw_delta = False
+    completed_status = "unknown"
+
     for event in turn.stream():
         event_count += 1
-        print(event.method, event.payload)
+        if event.method == "turn/started":
+            saw_started = True
+            print("stream.started")
+            continue
+        if event.method == "item/agentMessage/delta":
+            delta = getattr(event.payload, "delta", "")
+            if delta:
+                if not saw_delta:
+                    print("assistant> ", end="", flush=True)
+                print(delta, end="", flush=True)
+                saw_delta = True
+            continue
+        if event.method == "turn/completed":
+            completed_status = getattr(event.payload.turn.status, "value", str(event.payload.turn.status))
 
+    if saw_delta:
+        print()
+    else:
+        persisted = thread.read(include_turns=True)
+        persisted_turn = find_turn_by_id(persisted.thread.turns, turn.id)
+        final_text = assistant_text_from_turn(persisted_turn).strip() or "[no assistant text]"
+        print("assistant>", final_text)
+
+    print("stream.started.seen:", saw_started)
+    print("stream.completed:", completed_status)
     print("events.count:", event_count)