QUERY · ISSUE

Installing MicroPython Asyncio from Thonny Package Manager Successful, But import of uasyncio module fails?

openby Jibun-no-Kageopened 2022-08-13updated 2022-08-13

bug

Consistent and repeatable... ValueError: incompatible .mpy file results on module import. Installing MicroPython Asyncio from Thonny Package Manager Successful, But import of uasyncio module fails? Please fix.

Using latest nightly build same issue.

CANDIDATE · ISSUE

Import / AttributeError error in new asyncio

closedby DrTomopened 2021-05-15updated 2025-09-10

py-core

If some module imports with from uasyncio import * and then the this module
is imported somewhere else there will occur an AttributeError if e.g. start_server is invoked:

AttributeError: 'module' object has no attribute 'start_server'

The culprit is the "lazy loading" in: https://github.com/micropython/micropython/blob/master/extmod/uasyncio/init.py#L8-L30
Replacing the lazy loading with regular import solves the problem.

Assessment

Q Qwen · high

Both issues concern the uasyncio module in MicroPython, but they describe different problems. Issue #9048 reports a 'ValueError: incompatible .mpy file' error when importing uasyncio after installing via Thonny Package Manager, which is a file format/compatibility issue. Issue #7266 reports an 'AttributeError: module object has no attribute start_server' caused by lazy loading mechanics in uasyncio's init.py. These are distinct bugs with different error signatures, root causes, and symptoms. The candidate issue does not resolve the query's problem.

Suggested action

Keep both issues open as they address different bugs in the uasyncio module. The maintainer may want to review if there's any underlying connection between .mpy compatibility issues and lazy loading behavior.

Installing MicroPython Asyncio from Thonny Package Manager Successful, But import of uasyncio module fails?

Import / AttributeError error in new asyncio

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