feat: Update the usage method of the api_key and place the api_key in the environment variables.

Author: Andy

examples/travel_planner/README.md

@@ -4,18 +4,36 @@
 
 ## Getting started
 
-1. Install the dependencies
+1. update [config.json](config.json) with your own OpenAI API key etc.
+> You need to modify the values corresponding to model_name and base_url.
+
+```json
+
+{
+  "model_name":"qwen3-32b",
+  "api_key": "API_KEY",
+  "base_url": "https://dashscope.aliyuncs.com/compatible-mode/v1"
+}
+```
+2. Create an environment file with your API key:
+> You need to set the value corresponding to API_KEY.
+
+   ```bash
+   echo "API_KEY=your_api_key_here" > .env
+   ```
+
+3. Install the dependencies
    ```bash
    cd ~/a2a-python/
    pip install .
    ```
 
-2. Start the server
+4. Start the server
     ```bash
     uv run .
     ```
 
-3. Run the test client
+5. Run the test client
     ```bash
     uv run loop_client.py
     ```

examples/travel_planner/agent.py

@@ -1,6 +1,9 @@
 from langchain_openai import ChatOpenAI
 from langchain_core.messages import HumanMessage, SystemMessage
-import json,asyncio
+import json
+import sys
+import os
+
 from collections.abc import AsyncGenerator
 
 class TravelPlannerAgent:
@@ -11,10 +14,14 @@ def __init__(self):
         try:
             with open("config.json") as f:
                 config = json.load(f)
+            if not os.getenv(config["api_key"]):
+                print(f'{config["api_key"]} environment variable not set.')
+                sys.exit(1)
+            api_key = os.getenv(config["api_key"])
             self.model = ChatOpenAI(
                 model=config["model_name"],
                 base_url=config["base_url"],
-                api_key=config["api_key"],
+                api_key=api_key,
                 temperature=0.7  # Control the generation randomness (0-2, higher values indicate greater randomness)
             )
         except FileNotFoundError:

examples/travel_planner/config.json

@@ -1,5 +1,5 @@
 {
   "model_name":"qwen3-32b",
-  "api_key": "sk-74e8a7c32e2741ff892844597dcc31c1",
+  "api_key": "API_KEY",
   "base_url": "https://dashscope.aliyuncs.com/compatible-mode/v1"
 }