[ot] python/qemu: ot: use removeprefix() when possible

Signed-off-by: Emmanuel Blot <[email protected]>

Author: rivos-eblot

python/qemu/ot/km/dpe.py

@@ -176,9 +176,10 @@ def load_config(self, config_file: TextIO) -> None:
         self._config.read_file(config_file)
         loaded: set[str] = set()
         for section in self._config.sections():
-            if not section.startswith('ot_device '):
+            prefix = 'ot_device '
+            if not section.startswith(prefix):
                 continue
-            devname = section[len('ot_device '):].strip(' "')
+            devname = section.removeprefix(prefix).strip(' "')
             devdescs = devname.split('.')
             devtype = devdescs[0]
             if devtype == 'ot-lc_ctrl' and devtype not in loaded:

python/qemu/ot/otp/map.py

@@ -155,7 +155,7 @@ def _check_keymgr_materials(self, partname: str, items: dict[str, dict]) \
         for props in items.values():
             for prop, value in props.items():
                 if prop.startswith(kmprefix):
-                    kind = prop[len(kmprefix):]
+                    kind = prop.removeprefix(kmprefix)
                     if kind not in kms:
                         kms[kind] = set()
                     kms[kind].add(value)

python/qemu/ot/pyot/wrapper.py

@@ -356,9 +356,7 @@ def trig_match(bline):
                 self._post_process_asan(asan_file)
         xtime = ExecTime(xend-xstart) if xstart and xend else 0.0
         app_cmd_lead = f'{basename(tdef.command[0])}: '
-        if last_error.startswith(app_cmd_lead):
-            last_error = last_error[len(app_cmd_lead):]
-        return abs(ret) or 0, xtime, last_error
+        return abs(ret) or 0, xtime, last_error.removeprefix(app_cmd_lead)
 
     @classmethod
     def classify_log(cls, line: str, default: int = logging.ERROR,