stubtest: add --version (#12852)

Suggested in #12825

Co-authored-by: hauntsaninja <>

Author: hauntsaninja

mypy/stubtest.py

@@ -23,6 +23,7 @@
 import mypy.modulefinder
 import mypy.state
 import mypy.types
+import mypy.version
 from mypy import nodes
 from mypy.config_parser import parse_config_file
 from mypy.options import Options
@@ -1471,6 +1472,9 @@ def parse_options(args: List[str]) -> argparse.Namespace:
     parser.add_argument(
         "--check-typeshed", action="store_true", help="Check all stdlib modules in typeshed"
     )
+    parser.add_argument(
+        "--version", action="version", version="%(prog)s " + mypy.version.__version__
+    )
 
     return parser.parse_args(args)