Enforce Perflint rule PERF401 (#1608)

Author: DimitriPapadopoulos

.pre-commit-config.yaml

@@ -14,7 +14,7 @@ repos:
       - id: check-yaml
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.3.4
+    rev: v0.4.4
     hooks:
       # Run the linter.
       - id: ruff

fsspec/implementations/tests/test_dirfs.py

@@ -353,9 +353,7 @@ async def _walk(path, *args, **kwargs):
     adirfs.fs._walk = mocker.MagicMock()
     adirfs.fs._walk.side_effect = _walk
 
-    actual = []
-    async for entry in adirfs._walk("root", *ARGS, **KWARGS):
-        actual.append(entry)  # noqa: PERF402
+    actual = [entry async for entry in adirfs._walk("root", *ARGS, **KWARGS)]
     assert actual == [("root", ["foo", "bar"], ["baz", "qux"])]
     adirfs.fs._walk.assert_called_once_with(f"{PATH}/root", *ARGS, **KWARGS)
 

fsspec/implementations/tests/test_http.py

@@ -564,9 +564,7 @@ async def test_async_walk(server):
     fs = fsspec.filesystem("http", asynchronous=True, skip_instance_cache=True)
 
     # No maxdepth
-    res = []
-    async for a in fs._walk(server + "/index"):
-        res.append(a)  # noqa: PERF402
+    res = [a async for a in fs._walk(server + "/index")]
     assert res == [(server + "/index", [], ["realfile"])]
 
     # maxdepth=0