Python 3.16.0a1 Asyncio Event Loop Policy Removal Breaks pytest-asyncio Suites
“With pytest-asyncio 1.4.0 installed, every test errors, even sync ones. backoff, mock, cached-property and nest-asyncio break too.”
Evidence details
Original wording
“With pytest-asyncio 1.4.0 installed, every test errors, even sync ones. backoff, mock, cached-property and nest-asyncio break too.”
CleanApp AI summary
Python 3.16.0a1 Asyncio Event Loop Policy Removal Breaks pytest-asyncio Suites: The removal of asyncio's event loop policy API in Python 3.16.0a1 causes test suites using pytest-asyncio 1.4.0 to completely fail on every test, including synchronous tests. Downstream packages such as backoff, mock, and cached-property are also impacted.
- Source type
- Personal experience
- How received
- Imported
- Published
- Oct 14, 2026
- Added to CleanApp
- Oct 14, 2026
- Verification
- Unknown