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Throttles for Python coroutines.

Project description


aiothrottles synchronization primitives are designed to be extension to asyncio synchronization primitives.

For more details, see aiothrottles Documentation.


Throttle implements a rate limiting for asyncio task. A throttle can be used to guarantee limited access to a shared resources.

The preferred way to use a Throttle is an async with statement:

throttle = Throttle('3/s')

# ... later
async with throttle:
    # access shared state

which is equivalent to:

throttle  = Throttle('3/s')

# ... later
await throttle.acquire()
    # access shared state

A call rate is determined by the rate argument. Pass the rate in the following formats:

  • "{integer limit}/{unit time}"

  • "{limit's numerator}/{limit's denominator}{unit time}"

rate examples:

  • 4/s, 5/m, 6/h, 7/d

  • 1/second, 2/minute, 3/hour, 4/day

  • 1/3s, 12/37m, 1/5h, 8/3d


pip install aiothrottles


python install

Supported Python Versions

Python 3.6, 3.7, 3.8 and 3.9 are supported.


Run all tests.

python test

Run tests with PyTest.

python -m pytest [-k TEST_NAME] [-m MARKER]


aiothrottles is released under the BSD 3-Clause License.

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