selftests: net: py: coding style improvements

We're about to add more features here and finding new issues with old
ones in place is hard. Address ruff checks:
 - bare exceptions
 - f-string with no params
 - unused import

We need to use BaseException when handling defer(), as Petr points out.
This retains the old behavior of ignoring SIGTERM while running cleanups.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/20251120021024.2944527-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/tools/testing/selftests/net/lib/py/ksft.py b/tools/testing/selftests/net/lib/py/ksft.py
index 83b1574f7719..2eed24244b8a 100644
--- a/tools/testing/selftests/net/lib/py/ksft.py
+++ b/tools/testing/selftests/net/lib/py/ksft.py
@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
-import builtins
 import functools
 import inspect
 import signal
@@ -163,7 +162,7 @@ def ksft_flush_defer():
         entry = global_defer_queue.pop()
         try:
             entry.exec_only()
-        except:
+        except BaseException:
             ksft_pr(f"Exception while handling defer / cleanup (callback {i} of {qlen_start})!")
             tb = traceback.format_exc()
             for line in tb.strip().split('\n'):
@@ -181,7 +180,7 @@ def ksft_disruptive(func):
     @functools.wraps(func)
     def wrapper(*args, **kwargs):
         if not KSFT_DISRUPTIVE:
-            raise KsftSkipEx(f"marked as disruptive")
+            raise KsftSkipEx("marked as disruptive")
         return func(*args, **kwargs)
     return wrapper
 
@@ -199,7 +198,7 @@ def ksft_setup(env):
             return False
         try:
             return bool(int(value))
-        except:
+        except Exception:
             raise Exception(f"failed to parse {name}")
 
     if "DISRUPTIVE" in env: