[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[Andrew Svetlov]

Change by Andrew Svetlov :


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stage: resolved -> patch review

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[Andrew Svetlov]

Change by Andrew Svetlov :


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[miss-islington]

Change by miss-islington :


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pull_requests: +29642
pull_request: https://github.com/python/cpython/pull/31515

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[miss-islington]

Change by miss-islington :


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nosy: +miss-islington
nosy_count: 3.0 -> 4.0
pull_requests: +29641
pull_request: https://github.com/python/cpython/pull/31514

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[Andrew Svetlov]

Change by Andrew Svetlov :


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assignee:  -> asvetlov

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[Andrew Svetlov]

Change by Andrew Svetlov :


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versions: +Python 3.10, Python 3.11 -Python 3.8

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[Andrew Svetlov]

Change by Andrew Svetlov :


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keywords: +patch
pull_requests: +29639
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31512

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[issue44886] asyncio: create_datagram_endpoint() does not return a DatagramTransport

[Thomas Trummer]

New submission from Thomas Trummer :

According to the documentation[1] loop.create_datagram_endpoint() returns an 
asyncio.DatagramTransport. However on Windows this is not the case when the 
ProactorEventLoop is used (which seems to be the default since Python 3.8). 
This is a problem because a DatagramProtocol subclass needs a downcast in order 
to satisfy the type system (or mypy for that matter).


[1] 
https://docs.python.org/3/library/asyncio-protocol.html#asyncio.DatagramTransport

---

# Will print:  False

import asyncio


class EchoServerProtocol(asyncio.DatagramProtocol):
def connection_made(self, transport):
print(type(transport), isinstance(transport, asyncio.DatagramTransport))


async def main():
transport, protocol = await 
asyncio.get_running_loop().create_datagram_endpoint(
lambda: EchoServerProtocol(),
local_addr=('127.0.0.1', ))

try:
await asyncio.sleep(5)
finally:
transport.close()


asyncio.run(main())

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components: asyncio
messages: 399376
nosy: Thomas Trummer, asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: asyncio: create_datagram_endpoint() does not return a DatagramTransport
versions: Python 3.8, Python 3.9

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