yield-from-in-async-function (PLE1700)

Derived from the Pylint linter.

What it does

Checks for uses of yield from in async functions.

Why is this bad?

Python doesn't support the use of yield from in async functions, and will raise a SyntaxError in such cases.

Instead, considering refactoring the code to use an async for loop instead.

Example

async def numbers():
    yield from [1, 2, 3, 4, 5]

Use instead:

async def numbers():
    async for number in [1, 2, 3, 4, 5]:
        yield number