その上でオートフォーマッターとリンターを走らせた。コメントよりも、SphinxのようなIDEやドキュメントジェネレータでより簡単に見ることができるdocstringを追加しました。

```
"""Implementation and example usage for a Matrix message sending function."""
# https://matrix-nio.readthedocs.io/en/latest/examples.html#a-basic-client

from logger import get_logger
from nio import AsyncClient, MatrixRoom, RoomMessageText
import os
import asyncio
import datetime as dt

_logger = get_logger()

ELEM_ROOM = os.environ.get("ELEM_ROOM")
ELEM_USR = os.environ.get("ELEM_USR")
ELEM_PSW = os.environ.get("ELEM_PSW")


def send(message: str) -> None:
    """Send message to the Matrix room with environment variable ELEM_ROOM from ELEM_USR user with ELEM_PSW password."""

    async def message_callback_send(room: MatrixRoom, event: RoomMessageText) -> None:
        _logger.info(
            f"Message sent to room {room.display_name} | {room.user_name(event.sender)}: {event.body}"
        )

    async def send_message() -> None:
        client = AsyncClient("https://matrix.org", ELEM_USR)
        client.add_event_callback(message_callback_send, RoomMessageText)
        try:
            _logger.info(await client.login(ELEM_PSW))
        except ValueError as e:
            _logger.error(f"Failed to login - wrong or missing password?\n{e}")
            raise e
        await client.room_send(
            room_id=ELEM_ROOM,
            message_type="m.room.message",
            content={"msgtype": "m.text", "body": message},
        )
        _logger.info(f"Message sent to room {ELEM_ROOM} | {ELEM_USR}: {message}")
        await client.close()

    asyncio.get_event_loop().run_until_complete(send_message())


if __name__ == "__main__":
    msg = f"Hello world! {dt.datetime.now()}"
    send(msg)

```


外部スコープの変数と衝突しないように、msgの名前をmessageに変更し、コメントアウトされたコードを削除し（そのうちの1つは、下の行ですでに2つともログに記録されているので、いずれにせよ新しい変数は記録されません）、冗長な括弧を削除しました。また、send関数はすでに内部の非同期関数で使用されていたので、型付けを追加し、pydocstyleが推奨するものと一致するドキュメントも追加しました。
を追加した；

もしSynapseのようなローカルのマトリックスサーバーにアクセスできるのであれば、他のユーザーに迷惑をかけずに関数が動作することを確認するテストを書くこともできます。しかし、send_messageは127.0.0.1、またはローカルのインスタンスがある場所に接続する必要があり、そのサーバーからメッセージを読み込むために追加のコードが必要になります。
I ran an auto-formatter and a linter on it. Rather than comments, I added docstrings, which can be seen more easily by IDEs and documentation generators like Sphinx.

```
"""Implementation and example usage for a Matrix message sending function."""
# https://matrix-nio.readthedocs.io/en/latest/examples.html#a-basic-client

from logger import get_logger
from nio import AsyncClient, MatrixRoom, RoomMessageText
import os
import asyncio
import datetime as dt

_logger = get_logger()

ELEM_ROOM = os.environ.get("ELEM_ROOM")
ELEM_USR = os.environ.get("ELEM_USR")
ELEM_PSW = os.environ.get("ELEM_PSW")


def send(message: str) -> None:
    """Send message to the Matrix room with environment variable ELEM_ROOM from ELEM_USR user with ELEM_PSW password."""

    async def message_callback_send(room: MatrixRoom, event: RoomMessageText) -> None:
        _logger.info(
            f"Message sent to room {room.display_name} | {room.user_name(event.sender)}: {event.body}"
        )

    async def send_message() -> None:
        client = AsyncClient("https://matrix.org", ELEM_USR)
        client.add_event_callback(message_callback_send, RoomMessageText)
        try:
            _logger.info(await client.login(ELEM_PSW))
        except ValueError as e:
            _logger.error(f"Failed to login - wrong or missing password?\n{e}")
            raise e
        await client.room_send(
            room_id=ELEM_ROOM,
            message_type="m.room.message",
            content={"msgtype": "m.text", "body": message},
        )
        _logger.info(f"Message sent to room {ELEM_ROOM} | {ELEM_USR}: {message}")
        await client.close()

    asyncio.get_event_loop().run_until_complete(send_message())


if __name__ == "__main__":
    msg = f"Hello world! {dt.datetime.now()}"
    send(msg)

```


I renamed msg to message so it didn't conflict with outer scope variables, removed commented out code (one of which wouldn't have logged any new variables anyway since the line below already logged both of them), and removed a redundant parenthesis. I also added typing to the send function, since it was already used in the internal async functions, as well as documentation matching what pydocstyle recommends.
&nbsp;

If you have access to a local matrix server, such as one through Synapse, I could also write a test to ensure the function works without disturbing other users. However, send_message would need to connect to 127.0.0.1, or wherever the local instance is, and additional code would be needed to read messages from that server.