typing: add convinient option to clear the terminal to run_mypy.py

run_mypy.py

@@ -55,11 +55,16 @@ def main() -> int:
 
     parser = argparse.ArgumentParser(description='Process some integers.')
     parser.add_argument('-p', '--pretty', action='store_true', help='pretty print mypy errors')
+    parser.add_argument('-C', '--clear', action='store_true', help='clear the terminal before running mypy')
 
     opts = parser.parse_args()
     if opts.pretty:
         args.append('--pretty')
 
+    if opts.clear:
+        print('\x1bc', end='', flush=True)
+
+    print('Running mypy (this can take some time) ...')
     p = subprocess.run(
         [sys.executable, '-m', 'mypy'] + args + modules,
         cwd=root,