mypy_test.py: Fix argument-parsing for --python-version (#8134)

AlexWaygood · web-flow · commit 09141ec3dcdb · 2022-06-22T15:08:56.000+01:00
* mypy_test.py: Fix argument-parsing for `--python-version`

* Bump min version required in the README
diff --git a/tests/README.md b/tests/README.md
@@ -17,7 +17,7 @@ in the `CONTRIBUTING.md` document. In particular, we recommend running with Pyth
 
 ## mypy\_test.py
 
-This test requires Python 3.7+. Run using:
+This test requires Python 3.8+. Run using:
 ```
 (.venv3)$ python3 tests/mypy_test.py
 ```
diff --git a/tests/mypy_test.py b/tests/mypy_test.py
@@ -36,7 +36,7 @@
 parser.add_argument("-v", "--verbose", action="count", default=0, help="More output")
 parser.add_argument("-n", "--dry-run", action="store_true", help="Don't actually run mypy")
 parser.add_argument("-x", "--exclude", type=str, nargs="*", help="Exclude pattern")
-parser.add_argument("-p", "--python-version", type=str, nargs="*", help="These versions only (major[.minor])")
+parser.add_argument("-p", "--python-version", type=str, nargs="*", action="extend", help="These versions only (major[.minor])")
 parser.add_argument("--platform", help="Run mypy for a certain OS platform (defaults to sys.platform)")
 parser.add_argument("filter", type=str, nargs="*", help="Include pattern (default all)")
 
