From 70e7d8d06912d3246444bb53cbda833b241316c6 Mon Sep 17 00:00:00 2001
From: unikcc <19505579+unikcc@users.noreply.github.com>
Date: Sun, 5 Apr 2026 02:25:44 +0800
Subject: [PATCH] fix: guard against None comparison in quick_start.py example

total_cost_usd defaults to None, causing TypeError on None > 0.
Added truthiness check before comparison, consistent with other
example files like agents.py.
---
 examples/quick_start.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/quick_start.py b/examples/quick_start.py
index 3f128552..9fa32154 100644
--- a/examples/quick_start.py
+++ b/examples/quick_start.py
@@ -60,7 +60,11 @@ async def with_tools_example():
             for block in message.content:
                 if isinstance(block, TextBlock):
                     print(f"Claude: {block.text}")
-        elif isinstance(message, ResultMessage) and message.total_cost_usd > 0:
+        elif (
+            isinstance(message, ResultMessage)
+            and message.total_cost_usd
+            and message.total_cost_usd > 0
+        ):
             print(f"\nCost: ${message.total_cost_usd:.4f}")
     print()