add action node example

examples/write_novel.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+@Time    : 2024/2/1 12:01
+@Author  : alexanderwu
+@File    : write_novel.py
+"""
+import asyncio
+from typing import List
+
+from pydantic import BaseModel, Field
+
+from metagpt.actions.action_node import ActionNode
+from metagpt.llm import LLM
+
+
+class Novel(BaseModel):
+    name: str = Field(default="The Lord of the Rings", description="The name of the novel.")
+    user_group: str = Field(default="...", description="The user group of the novel.")
+    outlines: List[str] = Field(
+        default=["Chapter 1: ...", "Chapter 2: ...", "Chapter 3: ..."],
+        description="The outlines of the novel. No more than 10 chapters.",
+    )
+    background: str = Field(default="...", description="The background of the novel.")
+    character_names: List[str] = Field(default=["Frodo", "Gandalf", "Sauron"], description="The characters.")
+    conflict: str = Field(default="...", description="The conflict of the characters.")
+    plot: str = Field(default="...", description="The plot of the novel.")
+    ending: str = Field(default="...", description="The ending of the novel.")
+    chapter_1: str = Field(default="...", description="The content of chapter 1.")
+
+
+async def generate_novel():
+    instruction = "Write a novel named The Lord of the Rings. Fill the empty nodes with your own ideas."
+    return await ActionNode.from_pydantic(Novel).fill(context=instruction, llm=LLM())
+
+
+asyncio.run(generate_novel())