Address ruff issues

Also assorted similar issues.

Author: DimitriPapadopoulos

distutils/command/sdist.py

@@ -76,7 +76,7 @@ def checking_metadata(self) -> bool:
         (
             'keep-temp',
             'k',
-            "keep the distribution tree around after creating " + "archive file(s)",
+            "keep the distribution tree around after creating archive file(s)",
         ),
         (
             'dist-dir=',
@@ -206,8 +206,7 @@ def get_file_list(self) -> None:
 
         if not template_exists:
             self.warn(
-                ("manifest template '%s' does not exist " + "(using default file list)")
-                % self.template
+                f"manifest template '{self.template}' does not exist (using default file list)"
             )
         self.filelist.findall()
 

distutils/core.py

@@ -213,7 +213,7 @@ def run_commands(dist):
         if DEBUG:
             raise
         else:
-            raise SystemExit("error: " + str(msg))
+            raise SystemExit(f"error: {msg}")
 
     return dist
 

distutils/versionpredicate.py

@@ -129,7 +129,7 @@ def __init__(self, versionPredicateStr):
 
     def __str__(self):
         if self.pred:
-            seq = [cond + " " + str(ver) for cond, ver in self.pred]
+            seq = [f"{cond} {ver}" for cond, ver in self.pred]
             return self.name + " (" + ", ".join(seq) + ")"
         else:
             return self.name