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Name	Size	Permission	Date
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test_glob.py	18.21 KB	-rw-r--r--	2026-04-20 11:09
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tf_inherit_check.py	714 B	-rw-r--r--	2026-04-20 11:09
time_hashlib.py	2.87 KB	-rw-r--r--	2026-04-20 11:09
win_console_handler.py	1.38 KB	-rw-r--r--	2026-04-20 11:09
xmltests.py	499 B	-rw-r--r--	2026-04-20 11:09
zip_cp437_header.zip	270 B	-rw-r--r--	2026-03-03 16:09
zipdir.zip	374 B	-rw-r--r--	2026-03-03 16:09
zipdir_backslash.zip	192 B	-rw-r--r--	2026-03-03 16:09

Rename

"""Unit tests for the positional only argument syntax specified in PEP 570."""

import dis
import pickle
import unittest

from test.support import check_syntax_error

def global_pos_only_f(a, b, /):
    return a, b

def global_pos_only_and_normal(a, /, b):
    return a, b

def global_pos_only_defaults(a=1, /, b=2):
    return a, b

class PositionalOnlyTestCase(unittest.TestCase):

def assertRaisesSyntaxError(self, codestr, regex="invalid syntax"):
        with self.assertRaisesRegex(SyntaxError, regex):
            compile(codestr + "\n", "<test>", "single")

def test_invalid_syntax_errors(self):
        check_syntax_error(self, "def f(a, b = 5, /, c): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "def f(a = 5, b, /, c): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "def f(a = 5, b=1, /, c, *, d=2): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "def f(a = 5, b, /): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "def f(a, /, b = 5, c): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "def f(*args, /): pass")
        check_syntax_error(self, "def f(*args, a, /): pass")
        check_syntax_error(self, "def f(**kwargs, /): pass")
        check_syntax_error(self, "def f(/, a = 1): pass")
        check_syntax_error(self, "def f(/, a): pass")
        check_syntax_error(self, "def f(/): pass")
        check_syntax_error(self, "def f(*, a, /): pass")
        check_syntax_error(self, "def f(*, /, a): pass")
        check_syntax_error(self, "def f(a, /, a): pass", "duplicate argument 'a' in function definition")
        check_syntax_error(self, "def f(a, /, *, a): pass", "duplicate argument 'a' in function definition")
        check_syntax_error(self, "def f(a, b/2, c): pass")
        check_syntax_error(self, "def f(a, /, c, /): pass")
        check_syntax_error(self, "def f(a, /, c, /, d): pass")
        check_syntax_error(self, "def f(a, /, c, /, d, *, e): pass")
        check_syntax_error(self, "def f(a, *, c, /, d, e): pass")

def test_invalid_syntax_errors_async(self):
        check_syntax_error(self, "async def f(a, b = 5, /, c): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "async def f(a = 5, b, /, c): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "async def f(a = 5, b=1, /, c, d=2): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "async def f(a = 5, b, /): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "async def f(a, /, b = 5, c): pass", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "async def f(*args, /): pass")
        check_syntax_error(self, "async def f(*args, a, /): pass")
        check_syntax_error(self, "async def f(**kwargs, /): pass")
        check_syntax_error(self, "async def f(/, a = 1): pass")
        check_syntax_error(self, "async def f(/, a): pass")
        check_syntax_error(self, "async def f(/): pass")
        check_syntax_error(self, "async def f(*, a, /): pass")
        check_syntax_error(self, "async def f(*, /, a): pass")
        check_syntax_error(self, "async def f(a, /, a): pass", "duplicate argument 'a' in function definition")
        check_syntax_error(self, "async def f(a, /, *, a): pass", "duplicate argument 'a' in function definition")
        check_syntax_error(self, "async def f(a, b/2, c): pass")
        check_syntax_error(self, "async def f(a, /, c, /): pass")
        check_syntax_error(self, "async def f(a, /, c, /, d): pass")
        check_syntax_error(self, "async def f(a, /, c, /, d, *, e): pass")
        check_syntax_error(self, "async def f(a, *, c, /, d, e): pass")

def test_optional_positional_only_args(self):
        def f(a, b=10, /, c=100):
            return a + b + c

self.assertEqual(f(1, 2, 3), 6)
        self.assertEqual(f(1, 2, c=3), 6)
        with self.assertRaisesRegex(TypeError, r"f\(\) got some positional-only arguments passed as keyword arguments: 'b'"):
            f(1, b=2, c=3)

self.assertEqual(f(1, 2), 103)
        with self.assertRaisesRegex(TypeError, r"f\(\) got some positional-only arguments passed as keyword arguments: 'b'"):
            f(1, b=2)
        self.assertEqual(f(1, c=2), 13)

def f(a=1, b=10, /, c=100):
            return a + b + c

def test_syntax_for_many_positional_only(self):
        # more than 255 positional only arguments, should compile ok
        fundef = "def f(%s, /):\n  pass\n" % ', '.join('i%d' % i for i in range(300))
        compile(fundef, "<test>", "single")

def test_pos_only_definition(self):
        def f(a, b, c, /, d, e=1, *, f, g=2):
            pass

self.assertEqual(5, f.__code__.co_argcount)  # 3 posonly + 2 "standard args"
        self.assertEqual(3, f.__code__.co_posonlyargcount)
        self.assertEqual((1,), f.__defaults__)

def f(a, b, c=1, /, d=2, e=3, *, f, g=4):
            pass

self.assertEqual(5, f.__code__.co_argcount)  # 3 posonly + 2 "standard args"
        self.assertEqual(3, f.__code__.co_posonlyargcount)
        self.assertEqual((1, 2, 3), f.__defaults__)

def test_pos_only_call_via_unpacking(self):
        def f(a, b, /):
            return a + b

self.assertEqual(f(*[1, 2]), 3)

def test_use_positional_as_keyword(self):
        def f(a, /):
            pass
        expected = r"f\(\) got some positional-only arguments passed as keyword arguments: 'a'"
        with self.assertRaisesRegex(TypeError, expected):
            f(a=1)

def f(a, /, b):
            pass
        expected = r"f\(\) got some positional-only arguments passed as keyword arguments: 'a'"
        with self.assertRaisesRegex(TypeError, expected):
            f(a=1, b=2)

def f(a, b, /):
            pass
        expected = r"f\(\) got some positional-only arguments passed as keyword arguments: 'a, b'"
        with self.assertRaisesRegex(TypeError, expected):
            f(a=1, b=2)

def test_positional_only_and_arg_invalid_calls(self):
        def f(a, b, /, c):
            pass
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 1 required positional argument: 'c'"):
            f(1, 2)
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 2 required positional arguments: 'b' and 'c'"):
            f(1)
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 3 required positional arguments: 'a', 'b', and 'c'"):
            f()
        with self.assertRaisesRegex(TypeError, r"f\(\) takes 3 positional arguments but 4 were given"):
            f(1, 2, 3, 4)

def test_positional_only_and_optional_arg_invalid_calls(self):
        def f(a, b, /, c=3):
            pass
        f(1, 2)  # does not raise
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 1 required positional argument: 'b'"):
            f(1)
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 2 required positional arguments: 'a' and 'b'"):
            f()
        with self.assertRaisesRegex(TypeError, r"f\(\) takes from 2 to 3 positional arguments but 4 were given"):
            f(1, 2, 3, 4)

def test_positional_only_and_kwonlyargs_invalid_calls(self):
        def f(a, b, /, c, *, d, e):
            pass
        f(1, 2, 3, d=1, e=2)  # does not raise
        with self.assertRaisesRegex(TypeError, r"missing 1 required keyword-only argument: 'd'"):
            f(1, 2, 3, e=2)
        with self.assertRaisesRegex(TypeError, r"missing 2 required keyword-only arguments: 'd' and 'e'"):
            f(1, 2, 3)
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 1 required positional argument: 'c'"):
            f(1, 2)
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 2 required positional arguments: 'b' and 'c'"):
            f(1)
        with self.assertRaisesRegex(TypeError, r" missing 3 required positional arguments: 'a', 'b', and 'c'"):
            f()
        with self.assertRaisesRegex(TypeError, r"f\(\) takes 3 positional arguments but 6 positional arguments "
                                               r"\(and 2 keyword-only arguments\) were given"):
            f(1, 2, 3, 4, 5, 6, d=7, e=8)
        with self.assertRaisesRegex(TypeError, r"f\(\) got an unexpected keyword argument 'f'"):
            f(1, 2, 3, d=1, e=4, f=56)

def test_positional_only_invalid_calls(self):
        def f(a, b, /):
            pass
        f(1, 2)  # does not raise
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 1 required positional argument: 'b'"):
            f(1)
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 2 required positional arguments: 'a' and 'b'"):
            f()
        with self.assertRaisesRegex(TypeError, r"f\(\) takes 2 positional arguments but 3 were given"):
            f(1, 2, 3)

def test_positional_only_with_optional_invalid_calls(self):
        def f(a, b=2, /):
            pass
        f(1)  # does not raise
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 1 required positional argument: 'a'"):
            f()

with self.assertRaisesRegex(TypeError, r"f\(\) takes from 1 to 2 positional arguments but 3 were given"):
            f(1, 2, 3)

def test_no_standard_args_usage(self):
        def f(a, b, /, *, c):
            pass

f(1, 2, c=3)
        with self.assertRaises(TypeError):
            f(1, b=2, c=3)

def test_change_default_pos_only(self):
        def f(a, b=2, /, c=3):
            return a + b + c

self.assertEqual((2,3), f.__defaults__)
        f.__defaults__ = (1, 2, 3)
        self.assertEqual(f(1, 2, 3), 6)

def test_lambdas(self):
        x = lambda a, /, b: a + b
        self.assertEqual(x(1,2), 3)
        self.assertEqual(x(1,b=2), 3)

x = lambda a, /, b=2: a + b
        self.assertEqual(x(1), 3)

x = lambda a, b, /: a + b
        self.assertEqual(x(1, 2), 3)

x = lambda a, b, /, : a + b
        self.assertEqual(x(1, 2), 3)

def test_invalid_syntax_lambda(self):
        check_syntax_error(self, "lambda a, b = 5, /, c: None", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "lambda a = 5, b, /, c: None", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "lambda a = 5, b=1, /, c, *, d=2: None", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "lambda a = 5, b, /: None", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "lambda a, /, b = 5, c: None", "parameter without a default follows parameter with a default")
        check_syntax_error(self, "lambda *args, /: None")
        check_syntax_error(self, "lambda *args, a, /: None")
        check_syntax_error(self, "lambda **kwargs, /: None")
        check_syntax_error(self, "lambda /, a = 1: None")
        check_syntax_error(self, "lambda /, a: None")
        check_syntax_error(self, "lambda /: None")
        check_syntax_error(self, "lambda *, a, /: None")
        check_syntax_error(self, "lambda *, /, a: None")
        check_syntax_error(self, "lambda a, /, a: None", "duplicate argument 'a' in function definition")
        check_syntax_error(self, "lambda a, /, *, a: None", "duplicate argument 'a' in function definition")
        check_syntax_error(self, "lambda a, /, b, /: None")
        check_syntax_error(self, "lambda a, /, b, /, c: None")
        check_syntax_error(self, "lambda a, /, b, /, c, *, d: None")
        check_syntax_error(self, "lambda a, *, b, /, c: None")

def test_posonly_methods(self):
        class Example:
            def f(self, a, b, /):
                return a, b

self.assertEqual(Example().f(1, 2), (1, 2))
        self.assertEqual(Example.f(Example(), 1, 2), (1, 2))
        self.assertRaises(TypeError, Example.f, 1, 2)
        expected = r"f\(\) got some positional-only arguments passed as keyword arguments: 'b'"
        with self.assertRaisesRegex(TypeError, expected):
            Example().f(1, b=2)

def test_module_function(self):
        with self.assertRaisesRegex(TypeError, r"f\(\) missing 2 required positional arguments: 'a' and 'b'"):
            global_pos_only_f()

def test_closures(self):
        def f(x,y):
            def g(x2,/,y2):
                return x + y + x2 + y2
            return g

self.assertEqual(f(1,2)(3,4), 10)
        with self.assertRaisesRegex(TypeError, r"g\(\) missing 1 required positional argument: 'y2'"):
            f(1,2)(3)
        with self.assertRaisesRegex(TypeError, r"g\(\) takes 2 positional arguments but 3 were given"):
            f(1,2)(3,4,5)

def f(x,/,y):
            def g(x2,y2):
                return x + y + x2 + y2
            return g

self.assertEqual(f(1,2)(3,4), 10)

def f(x,/,y):
            def g(x2,/,y2):
                return x + y + x2 + y2
            return g

def test_annotations_in_closures(self):

def inner_has_pos_only():
            def f(x: int, /): ...
            return f

assert inner_has_pos_only().__annotations__ == {'x': int}

class Something:
            def method(self):
                def f(x: int, /): ...
                return f

assert Something().method().__annotations__ == {'x': int}

def multiple_levels():
            def inner_has_pos_only():
                def f(x: int, /): ...
                return f
            return inner_has_pos_only()

assert multiple_levels().__annotations__ == {'x': int}

def test_same_keyword_as_positional_with_kwargs(self):
        def f(something,/,**kwargs):
            return (something, kwargs)

self.assertEqual(f(42, something=42), (42, {'something': 42}))

with self.assertRaisesRegex(TypeError, r"f\(\) missing 1 required positional argument: 'something'"):
            f(something=42)

self.assertEqual(f(42), (42, {}))

def test_mangling(self):
        class X:
            def f(self, __a=42, /):
                return __a

def f2(self, __a=42, /, __b=43):
                return (__a, __b)

def f3(self, __a=42, /, __b=43, *, __c=44):
                return (__a, __b, __c)

self.assertEqual(X().f(), 42)
        self.assertEqual(X().f2(), (42, 43))
        self.assertEqual(X().f3(), (42, 43, 44))

def test_too_many_arguments(self):
        # more than 255 positional-only arguments, should compile ok
        fundef = "def f(%s, /):\n  pass\n" % ', '.join('i%d' % i for i in range(300))
        compile(fundef, "<test>", "single")

def test_serialization(self):
        pickled_posonly = pickle.dumps(global_pos_only_f)
        pickled_optional = pickle.dumps(global_pos_only_and_normal)
        pickled_defaults = pickle.dumps(global_pos_only_defaults)

unpickled_posonly = pickle.loads(pickled_posonly)
        unpickled_optional = pickle.loads(pickled_optional)
        unpickled_defaults = pickle.loads(pickled_defaults)

self.assertEqual(unpickled_posonly(1,2), (1,2))
        expected = r"global_pos_only_f\(\) got some positional-only arguments "\
                   r"passed as keyword arguments: 'a, b'"
        with self.assertRaisesRegex(TypeError, expected):
            unpickled_posonly(a=1,b=2)

self.assertEqual(unpickled_optional(1,2), (1,2))
        expected = r"global_pos_only_and_normal\(\) got some positional-only arguments "\
                   r"passed as keyword arguments: 'a'"
        with self.assertRaisesRegex(TypeError, expected):
            unpickled_optional(a=1,b=2)

self.assertEqual(unpickled_defaults(), (1,2))
        expected = r"global_pos_only_defaults\(\) got some positional-only arguments "\
                   r"passed as keyword arguments: 'a'"
        with self.assertRaisesRegex(TypeError, expected):
            unpickled_defaults(a=1,b=2)

def test_async(self):

async def f(a=1, /, b=2):
            return a, b

with self.assertRaisesRegex(TypeError, r"f\(\) got some positional-only arguments passed as keyword arguments: 'a'"):
            f(a=1, b=2)

def _check_call(*args, **kwargs):
            try:
                coro = f(*args, **kwargs)
                coro.send(None)
            except StopIteration as e:
                result = e.value
            self.assertEqual(result, (1, 2))

_check_call(1, 2)
        _check_call(1, b=2)
        _check_call(1)
        _check_call()

def test_generator(self):

def f(a=1, /, b=2):
            yield a, b

with self.assertRaisesRegex(TypeError, r"f\(\) got some positional-only arguments passed as keyword arguments: 'a'"):
            f(a=1, b=2)

gen = f(1, 2)
        self.assertEqual(next(gen), (1, 2))
        gen = f(1, b=2)
        self.assertEqual(next(gen), (1, 2))
        gen = f(1)
        self.assertEqual(next(gen), (1, 2))
        gen = f()
        self.assertEqual(next(gen), (1, 2))

def test_super(self):

sentinel = object()

class A:
            def method(self):
                return sentinel

class C(A):
            def method(self, /):
                return super().method()

self.assertEqual(C().method(), sentinel)

def test_annotations_constant_fold(self):
        def g():
            def f(x: not (int is int), /): ...

# without constant folding we end up with
        # COMPARE_OP(is), IS_OP (0)
        # with constant folding we should expect a IS_OP (1)
        codes = [(i.opname, i.argval) for i in dis.get_instructions(g)]
        self.assertNotIn(('UNARY_NOT', None), codes)
        self.assertIn(('IS_OP', 1), codes)

if __name__ == "__main__":
    unittest.main()