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Useful utilities for working with asyncio.

Project description


Useful utilities for working with asyncio.


Provides a convenient wrapper around asyncio.gather.

from asyncio_tools import gather, CompoundException

async def good():
    return 'OK'

async def bad():
    raise ValueError()

async def main():
    response = await gather(

    # Check if a particular exception was raised.
    ValueError in response.exception_types
    # >>> True

    # To get all exceptions:
    # >>> [ValueError()]

    # To get all instances of a particular exception:
    # >>> [ValueError()]

    # To get the number of exceptions:
    # >>> 1

    # You can still access all of the results:
    # >>> ['OK', ValueError(), 'OK']

    # And can access all successes (i.e. non-exceptions):
    # >>> ['OK', 'OK']

    # To get the number of successes:
    # >>> 2

        # To combines all of the exceptions into a single one, which merges the
        # messages.
        raise response.compound_exception()
    except CompoundException as compound_exception:
        print("Caught it")

        if ValueError in compound_exception.exception_types:
            print("Caught a ValueError")

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