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Wrong type hint for tracing Signal sequence #3595

stj opened this issue Feb 6, 2019 · 2 comments


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commented Feb 6, 2019

Long story short

Type hints for tracing Signal contents look wrong.

Expected behaviour

mypy does not report an error when adding handlers to a signal object.

Actual behaviour

mypy reports an error of

error: List item 0 has incompatible type "Callable[[ClientSession, SimpleNamespace, TraceConnectionCreateEndParams], Coroutine[Any, Any, None]]"; expected "Callable[[TraceConfig], Awaitable[None]]"

Steps to reproduce

Run mypy over this snippet

import types

import aiohttp
import datadog

async def reuse_keepalive_connection(
    session: aiohttp.ClientSession,
    trace_config_ctx: types.SimpleNamespace,
    params: aiohttp.TraceConnectionReuseconnParams,
) -> None:
    """statsd counter; how often has a connection been reused"""

tracer = aiohttp.TraceConfig()

Your environment

aiohttp 3.5.4
python 3.7.2
mypy 0.660

@stj stj referenced this issue Feb 6, 2019
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commented Feb 6, 2019 thinks the contributor most likely able to help you is @asvetlov.

Possibly related issues are #401 (Signals), #1749 (Type hinting in code), #3230 (iter_chunks type annotation wrong), #3032 (Doc: signals), and #1309 (Client Tracing).


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commented May 8, 2019

Fixed by #3596

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