Python contextlib.AsyncContextDecorator用法及代码示例

用法: class contextlib.AsyncContextDecorator

类似于ContextDecorator，但仅适用于异步函数。

AsyncContextDecorator 的示例：

from asyncio import run
from contextlib import AsyncContextDecorator

class mycontext(AsyncContextDecorator):
    async def __aenter__(self):
        print('Starting')
        return self

    async def __aexit__(self, *exc):
        print('Finishing')
        return False

>>> @mycontext()
... async def function():
...     print('The bit in the middle')
...
>>> run(function())
Starting
The bit in the middle
Finishing

>>> async def function():
...    async with mycontext():
...         print('The bit in the middle')
...
>>> run(function())
Starting
The bit in the middle
Finishing

3.10 版中的新函数。

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注：本文由纯净天空筛选整理自python.org大神的英文原创作品 contextlib.AsyncContextDecorator。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。