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�$� � �0%r r �delayr" c �r � t j � }t | �|j � | z � S d� S )a Timeout async context manager.
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of code or in cases when asyncio.wait_for is not suitable. For example:
>>> async with asyncio.timeout(10): # 10 seconds timeout
... await long_running_task()
delay - value in seconds or None to disable timeout logic
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undefined starting base, e.g. the time of the system power on.
>>> async with asyncio.timeout_at(loop.time() + 10):
... await long_running_task()
when - a deadline when timeout occurs or None to disable timeout logic
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the top-most affected timeout() context manager converts CancelledError
into TimeoutError.
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