I'm looking to get mypy working with 2.0 and it looks like every task's return value is changed to

None

instead of what is hinted at in the method. Does anyone know of a work-around besides ignoring the errors?

Hey @Nick DeCraene! At first look it looks like you are returning the RunContext object correctly in the get_ctx task. Would you mind sharing that class definition if you have it? Also wanted to mention that since you are getting an object called RunContext(), it might be worth looking into creating a new block for this context and loading it that way? https://docs.prefect.io/concepts/blocks/?h=class#creating-new-block-types

ah so that RunContext is just a python dataclass. It is really just an easier way to group different vars that we want to use for different tasks. But now that i say that, i do wonder if we need it anymore, given 2.0 flows are just normal functions. In 1.0 we would use this to pass metadata from one task to the next. I do have another example of mypy having issues with the same scenario but its a

List[Tuple[int, str]]

instead

Are you able to provide the simple example you are using with the List[Tuple[int,str]] parameter? It should being coerced correctly as long as the type hint is set correctly: https://orion-docs.prefect.io/concepts/flows/#parameters and https://discourse.prefect.io/t/does-prefect-perform-a-type-validation-on-input-parameters/55

@Rob Freedy sorry this took a second, here's the other example:

@task(retries=3, retry_delay_seconds=10)
def get_cids(
    cid_to_run: Optional[str] = None,
    org_to_run: Optional[int] = None,
    all_orgs: bool = False,
) -> List[Tuple[int, str]]:
    """Get a list cids and org ids to pull data for [(org, cid), (org, cid), ...]"""

    with ro_session_scope() as session:
        info = get_info(session, cid_to_run, org_to_run, all_orgs)
            
    return [(i[0], i[1]) for i in info]


@flow(name="my_flow")
def run_experiments(
    cid_to_run: Optional[str] = None,
    org_to_run: Optional[int] = None,
):
    org_cids: List[Tuple[int, str]] = get_cids(cid_to_run, org_to_run, all_orgs=True)
    # rest of the flow here

get_cids pretty much just grabs some info from a db, but always returns a List[Tuple[int, str]]. The mypy issue occurs when assigning

org_cids

as

None

can't be cast to

List

are you able to provide the full stack trace of the error you are getting? I have not been able to recreate the error