from langchain.agents import create_agent,AgentState
from langchain_core.messages import HumanMessage
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.store.memory import InMemoryStore
from langgraph.prebuilt import ToolRuntime
from langchain_deepseek import ChatDeepSeek
from typing import TypedDict, Annotated
from env_utils import DEEPSEEK_API_KEY, DEEPSEEK_BASE_URL
from langchain_core.tools import tool
@tool
def get_weather(city: str) -> str:
"""查询指定城市的天气信息"""
return f"The weather in {city} is sunny with a temperature of 25 degrees Celsius"
deepseek_llm = ChatDeepSeek(
model='deepseek-chat',
api_key=DEEPSEEK_API_KEY,
base_url=DEEPSEEK_BASE_URL
)
model_bind_tool=deepseek_llm.bind_tools(get_weather)
resp=model_bind_tool.invoke("北京的天气")
messages=\[\]
human_message=HumanMessage(content="北京的天气")
print(type(human_message))
print(human_message)
messages.append(human_message)
resp=model_bind_tool.invoke(messages)
print(type(resp))
print(resp)
messages.append(resp)
for tool_call in resp.tool_calls:
if tool_call'name' == 'get_weather':
tool_result= get_weather.invoke(tool_call)
messages.append(tool_result)
print(type(tool_result))
print(tool_result)
resp=model_bind_tool.invoke(messages)
messages.append(resp)
print('3333333333333333333333')
print(type(resp))
print(resp)
print('44444444444444444444444')
print(messages)
[HumanMessage(content='北京的天气', additional_kwargs={}, response_metadata={}),
AIMessage(content='', additional_kwargs={'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 44, 'prompt_tokens': 274, 'total_tokens': 318, 'completion_tokens_details': None, 'prompt_tokens_details': {'audio_tokens': None, 'cached_tokens': 256}, 'prompt_cache_hit_tokens': 256, 'prompt_cache_miss_tokens': 18}, 'model_provider': 'deepseek', 'model_name': 'deepseek-v4-flash', 'system_fingerprint': 'fp_8b330d02d0_prod0820_fp8_kvcache_20260402', 'id': '0d85cad8-de94-446b-b5a1-0a78fa84b7ab', 'finish_reason': 'tool_calls', 'logprobs': None}, id='lc_run--019e643d-b9b9-71f3-b8c4-38b1a9726ecd-0',
tool_calls={'name': 'get_weather', 'args': {'city': '北京'}, 'id': 'call_00_6DRAcna86ZrbvZJL0SGz5418', 'type': 'tool_call'}, invalid_tool_calls=\[\], usage_metadata={'input_tokens': 274, 'output_tokens': 44, 'total_tokens': 318, 'input_token_details': {'cache_read': 256}, 'output_token_details': {}}),
ToolMessage(content='The weather in 北京 is sunny with a temperature of 25 degrees Celsius', name='get_weather', tool_call_id='call_00_6DRAcna86ZrbvZJL0SGz5418'),
AIMessage(content='北京的天气情况如下：\n\n- **天气状况**：☀️ 晴天\n- **温度**：🌡️ 25°C\n\n是一个阳光明媚的好天气，温度舒适宜人，适合外出活动。', additional_kwargs={'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 45, 'prompt_tokens': 344, 'total_tokens': 389, 'completion_tokens_details': None, 'prompt_tokens_details': {'audio_tokens': None, 'cached_tokens': 256}, 'prompt_cache_hit_tokens': 256, 'prompt_cache_miss_tokens': 88}, 'model_provider': 'deepseek', 'model_name': 'deepseek-v4-flash', 'system_fingerprint': 'fp_8b330d02d0_prod0820_fp8_kvcache_20260402', 'id': 'c85e83f0-f71c-462a-8cb7-a5255cdf1005', 'finish_reason': 'stop', 'logprobs': None}, id='lc_run--019e643d-bd3d-7183-982e-668f43917cf6-0', tool_calls=\[\], invalid_tool_calls=\[\], usage_metadata={'input_tokens': 344, 'output_tokens': 45, 'total_tokens': 389, 'input_token_details': {'cache_read': 256}, 'output_token_details': {}})]