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Description:

asynctimeout 4.0.3

asyncio-compatible timeout context manager.

Usage example
The context manager is useful in cases when you want to apply timeout
logic around block of code or in cases when asyncio.wait_for() is
not suitable. Also it’s much faster than asyncio.wait_for()
because timeout doesn’t create a new task.
The timeout(delay, *, loop=None) call returns a context manager
that cancels a block on timeout expiring:
from async_timeout import timeout
async with timeout(1.5):
await inner()

If inner() is executed faster than in 1.5 seconds nothing
happens.
Otherwise inner() is cancelled internally by sending
asyncio.CancelledError into but asyncio.TimeoutError is
raised outside of context manager scope.

timeout parameter could be None for skipping timeout functionality.
Alternatively, timeout_at(when) can be used for scheduling
at the absolute time:
loop = asyncio.get_event_loop()
now = loop.time()

async with timeout_at(now + 1.5):
await inner()
Please note: it is not POSIX time but a time with
undefined starting base, e.g. the time of the system power on.
Context manager has .expired property for check if timeout happens
exactly in context manager:
async with timeout(1.5) as cm:
await inner()
print(cm.expired)
The property is True if inner() execution is cancelled by
timeout context manager.
If inner() call explicitly raises TimeoutError cm.expired
is False.
The scheduled deadline time is available as .deadline property:
async with timeout(1.5) as cm:
cm.deadline
Not finished yet timeout can be rescheduled by shift_by()
or shift_to() methods:
async with timeout(1.5) as cm:
cm.shift(1) # add another second on waiting
cm.update(loop.time() + 5) # reschedule to now+5 seconds
Rescheduling is forbidden if the timeout is expired or after exit from async with
code block.

Installation
$ pip install async-timeout
The library is Python 3 only!

Authors and License
The module is written by Andrew Svetlov.
It’s Apache 2 licensed and freely available.