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aleksandr.chernov1 avatar image
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Exception handling during asyncio tasks

Hello.

In following code example objs variable will be empty (the results of all tasks will be lost), because one of the tasks raised exception. How can I come over that? For example, so that one of the tasks returns a normal answer, and the other returns just None.

Thank you.

tasks_gather = asyncio.gather(
    historical_pricing.events.Definition(universe = 'RUBONOR=',start = '2021-12-20 00:00',end = '2021-12-20 01:00').get_data_async(),
    historical_pricing.events.Definition(universe = 'RUBONOR=',start = '2021-12-20 01:00',end = '2021-12-20 02:00').get_data_async())

try:
    asyncio.get_event_loop().run_until_complete(tasks_gather)
    objs = tasks_gather.result()
except rd.errors.RDError as e:
    print("RDError code :", e.code)
    print("RDError message:", e.message)


exceptionasynchronous
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umer.nalla avatar image
25.3k ●87 ●12 ●25

Hi @aleksandr.chernov1

The RD Python lib team have advised something like the following:

tasks_gather = asyncio.gather(historical_pricing.events.Definition(universe = 'RUBONOR=',
    start = '2021-12-20 00:00',
    end = '2021-12-20 01:00').get_data_async(),
    historical_pricing.events.Definition(universe = 'RUBONOR=',
    start = '2021-12-20 01:00',
    end = '2021-12-20 02:00').get_data_async(),
    return_exceptions=True
)
asyncio.get_event_loop().run_until_complete(tasks_gather)
good_response_1, error_2 = tasks_gather.result()
display(good_response_1.data.df)
display(error_2.message, error_2.code)



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umer.nalla avatar image umer.nalla

hi @aleksandr.chernov1

you can read more about the above technique at https://docs.python.org/3/library/asyncio-task.html#asyncio.gather


aleksandr.chernov1 avatar image aleksandr.chernov1
Thank you!

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