Use f-strings

Author: hugovk

Diff for: setup.py

@@ -47,17 +47,17 @@ def _stamp_version(filename: str) -> None:
         with open(filename) as f:
             for line in f:
                 if "__version__ =" in line:
-                    line = line.replace("\"git\"", "'%s'" % VERSION)
+                    line = line.replace("\"git\"", f"'{VERSION}'")
                     found = True
                 out.append(line)
     except OSError:
-        print("Couldn't find file %s to stamp version" % filename, file=sys.stderr)
+        print(f"Couldn't find file {filename} to stamp version", file=sys.stderr)
 
     if found:
         with open(filename, "w") as f:
             f.writelines(out)
     else:
-        print("WARNING: Couldn't find version line in file %s" % filename, file=sys.stderr)
+        print(f"WARNING: Couldn't find version line in file {filename}", file=sys.stderr)
 
 
 def build_py_modules(basedir: str, excludes: Sequence = ()) -> Sequence: