How do you handle exceptions and partial results from several asyncio tasks?

Defines fail-fast, all-results, and partial-success behavior for concurrent asyncio operations.

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I decide the result contract before starting tasks: all-or-nothing, fail-fast, or itemized partial success. Every started task remains owned and awaited so its exception or cancellation is observed. TaskGroup can cancel siblings and raise an ExceptionGroup, while gather(return_exceptions=True) can return exceptions beside values. The caller must never mistake an incomplete batch for full success.

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Defines fail-fast, all-results, and partial-success behavior for concurrent asyncio operations.

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Defines fail-fast, all-results, and partial-success behavior for concurrent asyncio operations.
I decide the result contract before starting tasks: all-or-nothing, fail-fast, or itemized partial success. Every started task remains owned and awaited so its exception or cancellation is observed. TaskGroup can cancel siblings and raise an ExceptionGroup, while gather(return_exceptions=True) can return exceptions beside values. The caller must never mistake an incomplete batch for full success.
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For itemized work I keep a stable input identifier with each result and classify success, failure, and cancellation explicitly. If one failure invalidates everything, I stage output and publish only after the group succeeds. Side effects complicate fail-fast behavior because siblings may already have committed work before cancellation arrives. Idempotency and compensating or reconciled state are often more realistic than rollback.

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Awaiting only the first completed task
Reporting partial output as complete
Retrying every failure identically

How do you handle exceptions and partial results from several asyncio tasks?

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