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docs/em/docs/advanced/events.md
``` **🔑 👨💼** 🐍 🕳 👈 👆 💪 ⚙️ `with` 📄, 🖼, `open()` 💪 ⚙️ 🔑 👨💼: ```Python with open("file.txt") as file: file.read() ``` ⏮️ ⏬ 🐍, 📤 **🔁 🔑 👨💼**. 👆 🔜 ⚙️ ⚫️ ⏮️ `async with`: ```Python async with lifespan(app): await do_stuff() ``` 🕐❔ 👆 ✍ 🔑 👨💼 ⚖️ 🔁 🔑 👨💼 💖 🔛, ⚫️❔ ⚫️ 🔨 👈, ⏭ 🛬 `with` 🍫, ⚫️ 🔜 🛠️ 📟 ⏭ `yield`, & ⏮️ ❎ `with` 🍫, ⚫️ 🔜 🛠️ 📟 ⏮️ `yield`.
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docs/de/docs/advanced/events.md
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docs/pt/docs/advanced/events.md
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docs/en/docs/advanced/events.md
```Python async with lifespan(app): await do_stuff() ``` When you create a context manager or an async context manager like above, what it does is that, before entering the `with` block, it will execute the code before the `yield`, and after exiting the `with` block, it will execute the code after the `yield`.
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docs/ko/docs/advanced/events.md
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docs/zh/docs/advanced/events.md
# 事件:启动 - 关闭 **FastAPI** 支持定义在应用启动前,或应用关闭后执行的事件处理器(函数)。 事件函数既可以声明为异步函数(`async def`),也可以声明为普通函数(`def`)。 !!! warning "警告" **FastAPI** 只执行主应用中的事件处理器,不执行[子应用 - 挂载](sub-applications.md){.internal-link target=_blank}中的事件处理器。 ## `startup` 事件 使用 `startup` 事件声明 `app` 启动前运行的函数: ```Python hl_lines="8" {!../../../docs_src/events/tutorial001.py!} ``` 本例中,`startup` 事件处理器函数为项目数据库(只是**字典**)提供了一些初始值。 **FastAPI** 支持多个事件处理器函数。
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