Raise minimum python version to 3.8 (#3176)

script/clang-format

@@ -17,14 +17,14 @@ def run_format(args, queue, lock, failed_files):
     """Takes filenames out of queue and runs clang-format on them."""
     while True:
         path = queue.get()
-        invocation = ['clang-format-11']
+        invocation = ["clang-format-11"]
         if args.inplace:
-            invocation.append('-i')
+            invocation.append("-i")
         else:
-            invocation.extend(['--dry-run', '-Werror'])
+            invocation.extend(["--dry-run", "-Werror"])
         invocation.append(path)
 
-        proc = subprocess.run(invocation, capture_output=True, encoding='utf-8')
+        proc = subprocess.run(invocation, capture_output=True, encoding="utf-8")
         if proc.returncode != 0:
             with lock:
                 print_error_for_file(path, proc.stderr)
@@ -33,28 +33,36 @@ def run_format(args, queue, lock, failed_files):
 
 
 def progress_bar_show(value):
-    return value if value is not None else ''
+    return value if value is not None else ""
 
 
 def main():
     colorama.init()
 
     parser = argparse.ArgumentParser()
-    parser.add_argument('-j', '--jobs', type=int,
-                        default=multiprocessing.cpu_count(),
-                        help='number of format instances to be run in parallel.')
-    parser.add_argument('files', nargs='*', default=[],
-                        help='files to be processed (regex on path)')
-    parser.add_argument('-i', '--inplace', action='store_true',
-                        help='reformat files in-place')
-    parser.add_argument('-c', '--changed', action='store_true',
-                        help='only run on changed files')
+    parser.add_argument(
+        "-j",
+        "--jobs",
+        type=int,
+        default=multiprocessing.cpu_count(),
+        help="number of format instances to be run in parallel.",
+    )
+    parser.add_argument(
+        "files", nargs="*", default=[], help="files to be processed (regex on path)"
+    )
+    parser.add_argument(
+        "-i", "--inplace", action="store_true", help="reformat files in-place"
+    )
+    parser.add_argument(
+        "-c", "--changed", action="store_true", help="only run on changed files"
+    )
     args = parser.parse_args()
 
     try:
-        get_output('clang-format-11', '-version')
+        get_output("clang-format-11", "-version")
     except:
-        print("""
+        print(
+            """
         Oops. It looks like clang-format is not installed. 
         
         Please check you can run "clang-format-11 -version" in your terminal and install
@@ -62,16 +70,17 @@ def main():
         
         Note you can also upload your code as a pull request on GitHub and see the CI check
         output to apply clang-format.
-        """)
+        """
+        )
         return 1
 
     files = []
-    for path in git_ls_files(['*.cpp', '*.h', '*.tcc']):
+    for path in git_ls_files(["*.cpp", "*.h", "*.tcc"]):
         files.append(os.path.relpath(path, os.getcwd()))
 
     if args.files:
         # Match against files specified on command-line
-        file_name_re = re.compile('|'.join(args.files))
+        file_name_re = re.compile("|".join(args.files))
         files = [p for p in files if file_name_re.search(p)]
 
     if args.changed:
@@ -84,14 +93,16 @@ def main():
         task_queue = queue.Queue(args.jobs)
         lock = threading.Lock()
         for _ in range(args.jobs):
-            t = threading.Thread(target=run_format,
-                                 args=(args, task_queue, lock, failed_files))
+            t = threading.Thread(
+                target=run_format, args=(args, task_queue, lock, failed_files)
+            )
             t.daemon = True
             t.start()
 
         # Fill the queue with files.
-        with click.progressbar(files, width=30, file=sys.stderr,
-                               item_show_func=progress_bar_show) as bar:
+        with click.progressbar(
+            files, width=30, file=sys.stderr, item_show_func=progress_bar_show
+        ) as bar:
             for name in bar:
                 task_queue.put(name)
 
@@ -100,11 +111,11 @@ def main():
 
     except KeyboardInterrupt:
         print()
-        print('Ctrl-C detected, goodbye.')
+        print("Ctrl-C detected, goodbye.")
         os.kill(0, 9)
 
     sys.exit(len(failed_files))
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()