nonebot2/docs/api/dependencies.md

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---
contentSidebar: true
sidebarDepth: 0
---
# NoneBot.handler 模块
## 依赖注入处理模块
该模块实现了依赖注入的定义与处理。
## `Depends(dependency=None, *, use_cache=True)`
* **说明**
参数依赖注入装饰器
* **参数**
* `dependency: Optional[Callable[..., Any]] = None`: 依赖函数。默认为参数的类型注释。
* `use_cache: bool = True`: 是否使用缓存。默认为 `True`
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```python
def depend_func() -> Any:
return ...
def depend_gen_func():
try:
yield ...
finally:
...
async def handler(param_name: Any = Depends(depend_func), gen: Any = Depends(depend_gen_func)):
...
```