port_dml: Convert sys.stderr.write to print

It's easy to forget the trailing newline character when using
sys.stderr.write and there are some such cases. Fix by converting all of
them to print calls with file=sys.stderr instead. Replace printf-style
format strings with modern f-string formatting to make it more
beautiful.

Author: aeliasso

py/port_dml.py

@@ -1028,10 +1028,9 @@ def report(f, dest):
                 msg = 'template %r never instantiated' % (name,)
             else:
                 assert False
-            sys.stderr.write('%s:%d: warning WUNUSED: %s during build.'
-                             % (dest, line, msg)
-                             + ' Only partial porting possible\n')
-            sys.stderr.write('%s: original location\n' % (loc,))
+            print(f'{dest}:{line}: warning WUNUSED: {msg} during build. Only partial porting possible',
+                  file=sys.stderr)
+            print(f'{loc}: original location', file=sys.stderr)
 
 tags = {
     'PSHA1': PSHA1,
@@ -1152,19 +1151,18 @@ def main(argv):
             t = tags[tag](loc, ast.literal_eval(params))
             transformations.setdefault(t.phase, []).append((t, lineno, line))
         except:
-            sys.stderr.write("Unexpected error on this porting tag:\n")
-            sys.stderr.write(line)
-            sys.stderr.write("%s:%d: found here\n" % (tagfilename, lineno))
+            print("Unexpected error on this porting tag:", file=sys.stderr)
+            print(line, file=sys.stderr)
+            print(f"{tagfilename}:{lineno}: found here", file=sys.stderr)
             raise
 
     if not transformations:
-        sys.stderr.write('%s:0: error: no tags found matching file %r' % (
-            tagfilename, args.src))
+        print(f'{tagfilename}:0: error: no tags found matching file {args.src}', file=sys.stderr)
         exit(1)
 
     if args.compat and is_device_file(args.src):
-        sys.stderr.write('%s:0: warning: file contains device statement,'
-                         % (args.src,) + ' ignoring --compat flag\n')
+        print(f'{args.src}:0: warning: file contains device statement, ignoring --compat flag',
+              file=sys.stderr)
         args.compat = False
     src = SourceFile(args.src, args.compat)
     errors = 0
@@ -1174,14 +1172,14 @@ def main(argv):
                 t.apply(src)
             except PortingFailure as e:
                 (loc, _) = line.split(' porting ', 2)
-                sys.stderr.write("%s error%s: %s\n" % (
-                    loc, '' if e.tag is None else ' ' + e.tag, e))
-                sys.stderr.write("%s:%d: found here\n" % (tagfilename, lineno))
+                print(f"""{loc} error{'' if e.tag is None else ' ' + e.tag}: {e}""",
+                      file=sys.stderr)
+                print(f"{tagfilename}:{lineno}: found here", file=sys.stderr)
                 errors += 1
             except:
-                sys.stderr.write("Unexpected error on this porting tag:\n")
-                sys.stderr.write(line)
-                sys.stderr.write("%s:%d: found here\n" % (tagfilename, lineno))
+                print("Unexpected error on this porting tag:", file=sys.stderr)
+                print(line, file=sys.stderr)
+                print(f"{tagfilename}:{lineno}: found here", file=sys.stderr)
                 traceback.print_exc()
                 errors += 1
 
@@ -1191,9 +1189,9 @@ def main(argv):
         src.commit(f)
     if errors:
         total = sum(map(len, transformations.values()))
-        sys.stderr.write(f'''\
+        print(f'''\
 *** Failed to apply {errors} out of {total} porting tags; partial result saved to {args.dest}. Consider applying the failed tags manually.
-''')
+''', file=sys.stderr)
         exit(2)
 
 if __name__ == '__main__':