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Google 日历工具包

Google Calendar is a product of Google Workspace that allows users to organize their schedules and events. It is a cloud-based calendar that allows users to create, edit, and delete events. It also allows users to share their calendars with others.

概览​

本笔记本将帮助您开始使用 Google 日历工具包。该工具包与 Google 日历 API 交互，以执行各种日历操作。它允许您：

  • 创建事件。
  • 搜索事件。
  • 更新事件。
  • 在不同日历之间移动事件。
  • 删除事件。
  • 列出事件。

设置​

要使用此工具包，您需要：

  1. 拥有一个可访问 Google 日历的 Google 账号。
  2. 按照 Google Calendar API 文档 中的说明设置您的凭据。下载 credentials.json 文件后，您就可以开始使用 Google Calendar API 了。

要启用对单个工具的自动跟踪，请设置您的 LangSmith API 密钥：

# os.environ["LANGSMITH_TRACING"] = "true"
# os.environ["LANGSMITH_API_KEY"] = getpass.getpass("Enter your LangSmith API key: ")

安装​

此工具包位于 langchain-google 仓库的 langchain-google-community 包中。我们需要 calendar 额外依赖：

%pip install -qU langchain-google-community\[calendar\]

实例化​

默认情况下，工具包会读取本地的 credentials.json 文件。您也可以手动提供一个 Credentials 对象。

from langchain_google_community import CalendarToolkit

toolkit = CalendarToolkit()
API 参考：CalendarToolkit

自定义身份验证​

在幕后，使用以下方法创建了一个 googleapi 资源。 您可以手动构建一个 googleapi 资源以获得更多的身份验证控制。

from langchain_google_community import CalendarToolkit
from langchain_google_community.calendar.utils import (
    build_resource_service,
    get_google_credentials,
)

# Can review scopes here: https://developers.google.com/calendar/api/auth
# For instance, readonly scope is https://www.googleapis.com/auth/calendar.readonly
credentials = get_google_credentials(
    token_file="token.json",
    scopes=["https://www.googleapis.com/auth/calendar"],
    client_secrets_file="credentials.json",
)

api_resource = build_resource_service(credentials=credentials)
toolkit = CalendarToolkit(api_resource=api_resource)

工具​

查看可用工具：

tools = toolkit.get_tools()
tools
[CalendarCreateEvent(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>),
 CalendarSearchEvents(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>),
 CalendarUpdateEvent(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>),
 GetCalendarsInfo(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>),
 CalendarMoveEvent(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>),
 CalendarDeleteEvent(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>),
 GetCurrentDatetime(api_resource=<googleapiclient.discovery.Resource object at 0x10ad13fb0>)]

调用​

直接用参数调用​

您可以通过以字典格式传递所需参数来直接调用该工具。以下是使用 CalendarCreateEvent 工具创建新事件的示例。

from langchain_google_community.calendar.create_event import CalendarCreateEvent

tool = CalendarCreateEvent()
tool.invoke(
    {
        "summary": "Calculus exam",
        "start_datetime": "2025-07-11 11:00:00",
        "end_datetime": "2025-07-11 13:00:00",
        "timezone": "America/Mexico_City",
        "location": "UAM Cuajimalpa",
        "description": "Event created from the LangChain toolkit",
        "reminders": [{"method": "popup", "minutes": 60}],
        "conference_data": True,
        "color_id": "5",
    }
)
API 参考：CalendarCreateEvent
'Event created: https://www.google.com/calendar/event?eid=amoxdjVsM2UzMW51Yjk2czc4ajhvaGdkcGcgam9yZ2VhbmczM0Bt'

在代理中使用​

下面我们将展示如何将该工具包整合到代理中。

我们需要一个LLM或聊天模型：

pip install -qU "langchain[openai]"
import getpass
import os

if not os.environ.get("OPENAI_API_KEY"):
  os.environ["OPENAI_API_KEY"] = getpass.getpass("Enter API key for OpenAI: ")

from langchain.chat_models import init_chat_model

llm = init_chat_model("gpt-4o-mini", model_provider="openai")
from langgraph.prebuilt import create_react_agent

agent_executor = create_react_agent(llm, tools)
API 参考：create_react_agent
example_query = "Create a green event for this afternoon to go for a 30-minute run."

events = agent_executor.stream(
    {"messages": [("user", example_query)]},
    stream_mode="values",
)
for event in events:
    event["messages"][-1].pretty_print()
================================ Human Message =================================

Create a green event for this afternoon to go for a 30-minute run.
================================== Ai Message ==================================
Tool Calls:
  get_current_datetime (call_drHRRhm6pdvcAuqagONUEKs5)
 Call ID: call_drHRRhm6pdvcAuqagONUEKs5
  Args:
================================= Tool Message =================================
Name: get_current_datetime

Time zone: America/Mexico_City, Date and time: 2025-04-02 19:07:30
================================== Ai Message ==================================
Tool Calls:
  create_calendar_event (call_p60zSVMmmjTy5Ctezzmlb9zD)
 Call ID: call_p60zSVMmmjTy5Ctezzmlb9zD
  Args:
    summary: Run
    start_datetime: 2025-04-02 19:30:00
    end_datetime: 2025-04-02 20:00:00
    timezone: America/Mexico_City
    color_id: 2
================================= Tool Message =================================
Name: create_calendar_event

Event created: https://www.google.com/calendar/event?eid=czZyZHVpcG43ajNiY241dmJmNWwycjE0NWsgam9yZ2VhbmczM0Bt
================================== Ai Message ==================================

I have created a green event for your run this afternoon. You can view it [here](https://www.google.com/calendar/event?eid=czZyZHVpcG43ajNiY241dmJmNWwycjE0NWsgam9yZ2VhbmczM0Bt). Enjoy your run!

API 参考​