error: "FixtureRequest" has no attribute "param"

[nipunn1313]

Based on the instructions here
https://docs.pytest.org/en/6.2.x/fixture.html#parametrizing-fixtures

I believe that FixtureRequest.param is an optional param. It appears to exist at runtime. However, if I try
to access it, mypy gives an error

error: "FixtureRequest" has no attribute "param"

Using mypy 0.931
Using pytest 6.2.5

Can repro with

@pytest.fixture(params=["a", "b"])
def myfixture(request: pytest.FixtureRequest) -> str:
    return request.param

[tirkarthi]

https://docs.pytest.org/en/6.2.x/reference.html?highlight=fixturerequest#request

A request object gives access to the requesting test context and has an optional param attribute in case the fixture is parametrized indirectly.

See also #8073 which seems to be similar to this issue and #7469

[Zac-HD]

Totally reasonable feature request, I'm just closing it as a duplicate of #8073.

[nipunn1313]

I think #8073 scopes up this task quite a bit. The fix here is much smaller than the requirements for #8073.

Recommending reopening this task, and submitted a PR #10133 that fixes it.