- The asyncio AsyncHelper enters a quasi idle loop of switching between the asyncio event loop and the Qt event loop, where the asyncio event loop never receives new work at some point (besides yielding to Qt) and wastes memory and CPU cycles. Remedy this by signaling to AsyncHelper when asyncio's work is done. - Don't pass signals as parameters. - Fix comments in the asyncio examples that mentioned Trio. - Renamed the requirements files as only the Trio examples need them. - Remove unused imports. Pick-to: 6.4 Task-number: PYSIDE-2169 Change-Id: Ia7197ea3446dd6ae514089b0dd260214c458db6a Reviewed-by: Christian Tismer <tismer@stackless.com>