Fix a few ruff --preview warnings

pycheribuild/config/chericonfig.py

@@ -30,6 +30,7 @@
 import collections
 import getpass
 import grp
+import inspect
 import os
 import re
 import shutil
@@ -577,7 +578,7 @@ def _ensure_required_properties_set(self) -> bool:
             if key in self.__optional_properties:
                 continue
             # don't do the descriptor stuff:
-            value = object.__getattribute__(self, key)
+            value = inspect.getattr_static(self, key)
             if value is None:
                 raise RuntimeError("Required property " + key + " is not set!")
         assert self.cheri_sdk_dir.is_absolute(), self.cheri_sdk_dir

pycheribuild/config/config_loader_base.py

@@ -331,7 +331,7 @@ def _convert_type(self, loaded_result: _LoadedConfigValue) -> "Optional[T]":
         result = loaded_result.value
         # self.debug_msg("Converting", result, "to", self.value_type)
         # if the requested type is list, tuple, etc. use shlex.split() to convert strings to lists
-        if self.value_type != str and isinstance(result, str):
+        if self.value_type is not str and isinstance(result, str):
             if isinstance(self.value_type, type) and issubclass(self.value_type, collections.abc.Sequence):
                 string_value = result
                 result = shlex.split(string_value)

pycheribuild/projects/run_fvp.py

@@ -694,7 +694,7 @@ def add_hostbridge_params(*params):
                 tcp_ports += [gdb_port]
             # XXX this matches on any host address; that may not be quite right
             for x in self.extra_tcp_forwarding:
-                if x == "":
+                if not x:
                     self.fatal("Bad extra-tcp-forwarding (empty forward?)")
                     continue
                 hg = x.split("=")