@Marvin I have a async flow to run , when invoking the function

asyncio.run( earnings_demo_03_2024(
            env="qdevd",
            injected_code=".wf.set[`INITIAL_CACHE_POSTED_77]; .wf.setS[`FUNDAMENTAL_EXTRACTED]; .wf.set[`IBES_Cycle6_Loaded_77];",
        )
    )

MyPy Returns an error

Argument 1 to "run" has incompatible type "None"; expected "Coroutine[Any, Any, <nothing>]"Mypyarg-type

The function still runs properly but wondering why this error exists?

The error you are encountering with

asyncio.run

in MyPy is a result of

asyncio.run

expecting a coroutine, but possibly receiving an

Awaitable

that resolves to

None

. This seems to be a known issue. ### Explanation In Python,

asyncio.run

expects an argument that is of type

Coroutine

, but sometimes you might accidentally pass an

Awaitable

that doesn't exactly fit this type, causing MyPy to complain even though the actual runtime execution might work. Here's a summary of the scenario with a similar problem reported: - A user defined an asynchronous flow in Prefect (conforming to the example format in Prefect's issue 6054). - Encountered MyPy's argument type incompatibility error, even though the flow runs without issues. ### Potential Solution Ensure that the function you are passing to

asyncio.run

is indeed a coroutine. Here's an illustrative example:

python
import asyncio
from prefect import flow

@flow
async def earnings_demo_03_2024(env, injected_code):
    # your async code
    pass

# Ensure the function call is awaited correctly
asyncio.run(earnings_demo_03_2024(
    env="qdevd",
    injected_code=".wf.set[`INITIAL_CACHE_POSTED_77]; .wf.setS[`FUNDAMENTAL_EXTRACTED]; .wf.set[`IBES_Cycle6_Loaded_77];"
))

### Referenced Sources - Issue describing a similar problem - Python asyncio.run documentation If the issue persists, consider verifying the awaited function or checking for type inconsistencies specifically related to the type annotations in your function signature.