Create app.py

app.py

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+# gradio_gemini_chat.py
+# pip install -U google-genai gradio
+
+import os
+import traceback
+import gradio as gr
+from google import genai
+
+API_KEY = os.getenv("GOOGLE_API_KEY") or "AIzaSyBAgrcgtf30Sm_msEGKATQvXRBSq1yyaSM"
+MODEL_NAME = "gemini-2.5-flash"
+client = genai.Client(api_key=API_KEY)
+
+def build_contents_from_history_messages(history_msgs, user_msg):
+    """
+    history_msgs: List[{"role": "user"/"assistant", "content": str}]
+    轉成 google-genai 的 contents，並附上本輪 user_msg。
+    """
+    contents = []
+    for m in history_msgs:
+        role = m.get("role")
+        text = (m.get("content") or "").strip()
+        if not text:
+            continue
+        if role == "assistant":
+            contents.append({"role": "model", "parts": [{"text": text}]})
+        else:  # "user" 以外都當使用者
+            contents.append({"role": "user", "parts": [{"text": text}]})
+    if user_msg:
+        contents.append({"role": "user", "parts": [{"text": user_msg}]})
+    return contents
+
+def chat_fn(user_msg, history_msgs, sys_prompt):
+    user_msg = (user_msg or "").strip()
+    if not user_msg:
+        return history_msgs, ""
+
+    # 指令：清空
+    if user_msg.lower() in ("/reset", "/clear"):
+        return [], ""
+
+    try:
+        contents = build_contents_from_history_messages(history_msgs, user_msg)
+
+        kwargs = {}
+        if sys_prompt and sys_prompt.strip():
+            kwargs["system_instruction"] = sys_prompt.strip()
+
+        resp = client.models.generate_content(
+            model=MODEL_NAME,
+            contents=contents,
+            **kwargs
+        )
+        bot_text = (resp.text or "").strip()
+    except Exception as e:
+        bot_text = f"[發生錯誤]\n{e}\n\n{traceback.format_exc(limit=2)}"
+
+    # messages 形式需要依序 append 使用者與助理訊息
+    history_msgs = history_msgs + [
+        {"role": "user", "content": user_msg},
+        {"role": "assistant", "content": bot_text},
+    ]
+    return history_msgs, ""
+
+with gr.Blocks(title="Gemini Chat (google-genai + Gradio)") as demo:
+    gr.Markdown("## Gemini Chatbot（/reset 清空對話）")
+
+    sys_prompt = gr.Textbox(
+        label="System Prompt（可選）",
+        lines=2,
+        placeholder="例如：你是溫柔且穩重的助教，回答請精簡、有條理。"
+    )
+
+    # 改用 messages 形式，避免 'tuples' 的棄用警告
+    chatbot = gr.Chatbot(
+        label="對話",
+        height=500,
+        type="messages",
+    )
+
+    user_in = gr.Textbox(label="輸入訊息", lines=2, placeholder="打字聊天吧（/reset 清空）")
+    with gr.Row():
+        send_btn = gr.Button("送出", variant="primary")
+        clear_btn = gr.Button("清空對話")
+
+    send_btn.click(chat_fn, [user_in, chatbot, sys_prompt], [chatbot, user_in])
+    user_in.submit(chat_fn, [user_in, chatbot, sys_prompt], [chatbot, user_in])
+    clear_btn.click(lambda: ([], ""), None, [chatbot, user_in])
+
+if __name__ == "__main__":
+    # 讓 Gradio 自動挑可用埠（避免 7860 被占用錯誤）
+    # 在部分筆記本/雲端環境不要強制 inbrowser
+    demo.queue().launch(
+        server_port=None,   # 或寫 0 也可以
+        inbrowser=False,
+        share=False         # 需要外網連結時改成 True
+    )