Issue #26282: PyArg_ParseTupleAndKeywords() and Argument Clinic now support

positional-only and keyword parameters in the same function.

1 files changed, 25 insertions, 0 deletions

diff --git a/Lib/test/test_capi.py b/Lib/test/test_capi.py
index a0746f097a..6852381d01 100644
--- a/Lib/test/test_capi.py
+++ b/Lib/test/test_capi.py
@@ -527,6 +527,31 @@ class SkipitemTest(unittest.TestCase):
         self.assertRaises(ValueError, _testcapi.parse_tuple_and_keywords,
                           (), {}, b'', [42])
 
+    def test_positional_only(self):
+        parse = _testcapi.parse_tuple_and_keywords
+
+        parse((1, 2, 3), {}, b'OOO', ['', '', 'a'])
+        parse((1, 2), {'a': 3}, b'OOO', ['', '', 'a'])
+        with self.assertRaisesRegex(TypeError,
+                'Function takes at least 2 positional arguments \(1 given\)'):
+            parse((1,), {'a': 3}, b'OOO', ['', '', 'a'])
+        parse((1,), {}, b'O|OO', ['', '', 'a'])
+        with self.assertRaisesRegex(TypeError,
+                'Function takes at least 1 positional arguments \(0 given\)'):
+            parse((), {}, b'O|OO', ['', '', 'a'])
+        parse((1, 2), {'a': 3}, b'OO$O', ['', '', 'a'])
+        with self.assertRaisesRegex(TypeError,
+                'Function takes exactly 2 positional arguments \(1 given\)'):
+            parse((1,), {'a': 3}, b'OO$O', ['', '', 'a'])
+        parse((1,), {}, b'O|O$O', ['', '', 'a'])
+        with self.assertRaisesRegex(TypeError,
+                'Function takes at least 1 positional arguments \(0 given\)'):
+            parse((), {}, b'O|O$O', ['', '', 'a'])
+        with self.assertRaisesRegex(SystemError, 'Empty parameter name after \$'):
+            parse((1,), {}, b'O|$OO', ['', '', 'a'])
+        with self.assertRaisesRegex(SystemError, 'Empty keyword'):
+            parse((1,), {}, b'O|OO', ['', 'a', ''])
+
 
 @unittest.skipUnless(threading, 'Threading required for this test.')
 class TestThreadState(unittest.TestCase):