issue_comments: 939100803

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html_url issue_url id node_id user created_at updated_at author_association body reactions issue performed_via_github_app
https://github.com/simonw/datasette/pull/1481#issuecomment-939100803 https://api.github.com/repos/simonw/datasette/issues/1481 939100803 IC_kwDOBm6k_c43-YqD 9599 2021-10-08T20:33:42Z 2021-10-08T20:33:42Z OWNER

There's a tiny chance this could be a bug in Python 3.10 itself - I filed an issue here: https://bugs.python.org/issue45416 - in which I said:

In Python 3.10 it is not possible to instantiate an asyncio.Condition that wraps an asyncio.Lock without raising a "loop argument must agree with lock" exception.

This code raises that exception:

asyncio.Condition(asyncio.Lock())

This worked in previous Python versions.

Note that the error only occurs if an event loop is running. Here's a simple script that replicates the problem:

import asyncio

# This runs without an exception:
print(asyncio.Condition(asyncio.Lock()))

# This does not work:
async def example():
    print(asyncio.Condition(asyncio.Lock()))

# This raises "ValueError: loop argument must agree with lock":
asyncio.run(example())

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