Issue #15008: Implement PEP 362 "Signature Objects".
Patch by Yury Selivanov.
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 802e100..53c947f 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -1173,13 +1173,934 @@
self.assertIn(name, str(state))
+class TestSignatureObject(unittest.TestCase):
+ @staticmethod
+ def signature(func):
+ sig = inspect.signature(func)
+ return (tuple((param.name,
+ (... if param.default is param.empty else param.default),
+ (... if param.annotation is param.empty
+ else param.annotation),
+ str(param.kind).lower())
+ for param in sig.parameters.values()),
+ (... if sig.return_annotation is sig.empty
+ else sig.return_annotation))
+
+ def test_signature_object(self):
+ S = inspect.Signature
+ P = inspect.Parameter
+
+ self.assertEqual(str(S()), '()')
+
+ def test(po, pk, *args, ko, **kwargs):
+ pass
+ sig = inspect.signature(test)
+ po = sig.parameters['po'].replace(kind=P.POSITIONAL_ONLY)
+ pk = sig.parameters['pk']
+ args = sig.parameters['args']
+ ko = sig.parameters['ko']
+ kwargs = sig.parameters['kwargs']
+
+ S((po, pk, args, ko, kwargs))
+
+ with self.assertRaisesRegexp(ValueError, 'wrong parameter order'):
+ S((pk, po, args, ko, kwargs))
+
+ with self.assertRaisesRegexp(ValueError, 'wrong parameter order'):
+ S((po, args, pk, ko, kwargs))
+
+ with self.assertRaisesRegexp(ValueError, 'wrong parameter order'):
+ S((args, po, pk, ko, kwargs))
+
+ with self.assertRaisesRegexp(ValueError, 'wrong parameter order'):
+ S((po, pk, args, kwargs, ko))
+
+ kwargs2 = kwargs.replace(name='args')
+ with self.assertRaisesRegexp(ValueError, 'duplicate parameter name'):
+ S((po, pk, args, kwargs2, ko))
+
+ def test_signature_immutability(self):
+ def test(a):
+ pass
+ sig = inspect.signature(test)
+
+ with self.assertRaises(AttributeError):
+ sig.foo = 'bar'
+
+ with self.assertRaises(TypeError):
+ sig.parameters['a'] = None
+
+ def test_signature_on_noarg(self):
+ def test():
+ pass
+ self.assertEqual(self.signature(test), ((), ...))
+
+ def test_signature_on_wargs(self):
+ def test(a, b:'foo') -> 123:
+ pass
+ self.assertEqual(self.signature(test),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', ..., 'foo', "positional_or_keyword")),
+ 123))
+
+ def test_signature_on_wkwonly(self):
+ def test(*, a:float, b:str) -> int:
+ pass
+ self.assertEqual(self.signature(test),
+ ((('a', ..., float, "keyword_only"),
+ ('b', ..., str, "keyword_only")),
+ int))
+
+ def test_signature_on_complex_args(self):
+ def test(a, b:'foo'=10, *args:'bar', spam:'baz', ham=123, **kwargs:int):
+ pass
+ self.assertEqual(self.signature(test),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', 10, 'foo', "positional_or_keyword"),
+ ('args', ..., 'bar', "var_positional"),
+ ('spam', ..., 'baz', "keyword_only"),
+ ('ham', 123, ..., "keyword_only"),
+ ('kwargs', ..., int, "var_keyword")),
+ ...))
+
+ def test_signature_on_builtin_function(self):
+ with self.assertRaisesRegexp(ValueError, 'not supported by signature'):
+ inspect.signature(type)
+ with self.assertRaisesRegexp(ValueError, 'not supported by signature'):
+ # support for 'wrapper_descriptor'
+ inspect.signature(type.__call__)
+ with self.assertRaisesRegexp(ValueError, 'not supported by signature'):
+ # support for 'method-wrapper'
+ inspect.signature(min.__call__)
+ with self.assertRaisesRegexp(ValueError,
+ 'no signature found for builtin function'):
+ # support for 'method-wrapper'
+ inspect.signature(min)
+
+ def test_signature_on_non_function(self):
+ with self.assertRaisesRegexp(TypeError, 'is not a callable object'):
+ inspect.signature(42)
+
+ with self.assertRaisesRegexp(TypeError, 'is not a Python function'):
+ inspect.Signature.from_function(42)
+
+ def test_signature_on_method(self):
+ class Test:
+ def foo(self, arg1, arg2=1) -> int:
+ pass
+
+ meth = Test().foo
+
+ self.assertEqual(self.signature(meth),
+ ((('arg1', ..., ..., "positional_or_keyword"),
+ ('arg2', 1, ..., "positional_or_keyword")),
+ int))
+
+ def test_signature_on_classmethod(self):
+ class Test:
+ @classmethod
+ def foo(cls, arg1, *, arg2=1):
+ pass
+
+ meth = Test().foo
+ self.assertEqual(self.signature(meth),
+ ((('arg1', ..., ..., "positional_or_keyword"),
+ ('arg2', 1, ..., "keyword_only")),
+ ...))
+
+ meth = Test.foo
+ self.assertEqual(self.signature(meth),
+ ((('arg1', ..., ..., "positional_or_keyword"),
+ ('arg2', 1, ..., "keyword_only")),
+ ...))
+
+ def test_signature_on_staticmethod(self):
+ class Test:
+ @staticmethod
+ def foo(cls, *, arg):
+ pass
+
+ meth = Test().foo
+ self.assertEqual(self.signature(meth),
+ ((('cls', ..., ..., "positional_or_keyword"),
+ ('arg', ..., ..., "keyword_only")),
+ ...))
+
+ meth = Test.foo
+ self.assertEqual(self.signature(meth),
+ ((('cls', ..., ..., "positional_or_keyword"),
+ ('arg', ..., ..., "keyword_only")),
+ ...))
+
+ def test_signature_on_partial(self):
+ from functools import partial
+
+ def test():
+ pass
+
+ self.assertEqual(self.signature(partial(test)), ((), ...))
+
+ with self.assertRaisesRegexp(ValueError, "has incorrect arguments"):
+ inspect.signature(partial(test, 1))
+
+ with self.assertRaisesRegexp(ValueError, "has incorrect arguments"):
+ inspect.signature(partial(test, a=1))
+
+ def test(a, b, *, c, d):
+ pass
+
+ self.assertEqual(self.signature(partial(test)),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', ..., ..., "positional_or_keyword"),
+ ('c', ..., ..., "keyword_only"),
+ ('d', ..., ..., "keyword_only")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, 1)),
+ ((('b', ..., ..., "positional_or_keyword"),
+ ('c', ..., ..., "keyword_only"),
+ ('d', ..., ..., "keyword_only")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, 1, c=2)),
+ ((('b', ..., ..., "positional_or_keyword"),
+ ('c', 2, ..., "keyword_only"),
+ ('d', ..., ..., "keyword_only")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, b=1, c=2)),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', 1, ..., "positional_or_keyword"),
+ ('c', 2, ..., "keyword_only"),
+ ('d', ..., ..., "keyword_only")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, 0, b=1, c=2)),
+ ((('b', 1, ..., "positional_or_keyword"),
+ ('c', 2, ..., "keyword_only"),
+ ('d', ..., ..., "keyword_only"),),
+ ...))
+
+ def test(a, *args, b, **kwargs):
+ pass
+
+ self.assertEqual(self.signature(partial(test, 1)),
+ ((('args', ..., ..., "var_positional"),
+ ('b', ..., ..., "keyword_only"),
+ ('kwargs', ..., ..., "var_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, 1, 2, 3)),
+ ((('args', ..., ..., "var_positional"),
+ ('b', ..., ..., "keyword_only"),
+ ('kwargs', ..., ..., "var_keyword")),
+ ...))
+
+
+ self.assertEqual(self.signature(partial(test, 1, 2, 3, test=True)),
+ ((('args', ..., ..., "var_positional"),
+ ('b', ..., ..., "keyword_only"),
+ ('kwargs', ..., ..., "var_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, 1, 2, 3, test=1, b=0)),
+ ((('args', ..., ..., "var_positional"),
+ ('b', 0, ..., "keyword_only"),
+ ('kwargs', ..., ..., "var_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, b=0)),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('args', ..., ..., "var_positional"),
+ ('b', 0, ..., "keyword_only"),
+ ('kwargs', ..., ..., "var_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(partial(test, b=0, test=1)),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('args', ..., ..., "var_positional"),
+ ('b', 0, ..., "keyword_only"),
+ ('kwargs', ..., ..., "var_keyword")),
+ ...))
+
+ def test(a, b, c:int) -> 42:
+ pass
+
+ sig = test.__signature__ = inspect.signature(test)
+
+ self.assertEqual(self.signature(partial(partial(test, 1))),
+ ((('b', ..., ..., "positional_or_keyword"),
+ ('c', ..., int, "positional_or_keyword")),
+ 42))
+
+ self.assertEqual(self.signature(partial(partial(test, 1), 2)),
+ ((('c', ..., int, "positional_or_keyword"),),
+ 42))
+
+ psig = inspect.signature(partial(partial(test, 1), 2))
+
+ def foo(a):
+ return a
+ _foo = partial(partial(foo, a=10), a=20)
+ self.assertEqual(self.signature(_foo),
+ ((('a', 20, ..., "positional_or_keyword"),),
+ ...))
+ # check that we don't have any side-effects in signature(),
+ # and the partial object is still functioning
+ self.assertEqual(_foo(), 20)
+
+ def foo(a, b, c):
+ return a, b, c
+ _foo = partial(partial(foo, 1, b=20), b=30)
+ self.assertEqual(self.signature(_foo),
+ ((('b', 30, ..., "positional_or_keyword"),
+ ('c', ..., ..., "positional_or_keyword")),
+ ...))
+ self.assertEqual(_foo(c=10), (1, 30, 10))
+ _foo = partial(_foo, 2) # now 'b' has two values -
+ # positional and keyword
+ with self.assertRaisesRegexp(ValueError, "has incorrect arguments"):
+ inspect.signature(_foo)
+
+ def foo(a, b, c, *, d):
+ return a, b, c, d
+ _foo = partial(partial(foo, d=20, c=20), b=10, d=30)
+ self.assertEqual(self.signature(_foo),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', 10, ..., "positional_or_keyword"),
+ ('c', 20, ..., "positional_or_keyword"),
+ ('d', 30, ..., "keyword_only")),
+ ...))
+ ba = inspect.signature(_foo).bind(a=200, b=11)
+ self.assertEqual(_foo(*ba.args, **ba.kwargs), (200, 11, 20, 30))
+
+ def foo(a=1, b=2, c=3):
+ return a, b, c
+ _foo = partial(foo, a=10, c=13)
+ ba = inspect.signature(_foo).bind(11)
+ self.assertEqual(_foo(*ba.args, **ba.kwargs), (11, 2, 13))
+ ba = inspect.signature(_foo).bind(11, 12)
+ self.assertEqual(_foo(*ba.args, **ba.kwargs), (11, 12, 13))
+ ba = inspect.signature(_foo).bind(11, b=12)
+ self.assertEqual(_foo(*ba.args, **ba.kwargs), (11, 12, 13))
+ ba = inspect.signature(_foo).bind(b=12)
+ self.assertEqual(_foo(*ba.args, **ba.kwargs), (10, 12, 13))
+ _foo = partial(_foo, b=10)
+ ba = inspect.signature(_foo).bind(12, 14)
+ self.assertEqual(_foo(*ba.args, **ba.kwargs), (12, 14, 13))
+
+ def test_signature_on_decorated(self):
+ import functools
+
+ def decorator(func):
+ @functools.wraps(func)
+ def wrapper(*args, **kwargs) -> int:
+ return func(*args, **kwargs)
+ return wrapper
+
+ class Foo:
+ @decorator
+ def bar(self, a, b):
+ pass
+
+ self.assertEqual(self.signature(Foo.bar),
+ ((('self', ..., ..., "positional_or_keyword"),
+ ('a', ..., ..., "positional_or_keyword"),
+ ('b', ..., ..., "positional_or_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(Foo().bar),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', ..., ..., "positional_or_keyword")),
+ ...))
+
+ # Test that we handle method wrappers correctly
+ def decorator(func):
+ @functools.wraps(func)
+ def wrapper(*args, **kwargs) -> int:
+ return func(42, *args, **kwargs)
+ sig = inspect.signature(func)
+ new_params = tuple(sig.parameters.values())[1:]
+ wrapper.__signature__ = sig.replace(parameters=new_params)
+ return wrapper
+
+ class Foo:
+ @decorator
+ def __call__(self, a, b):
+ pass
+
+ self.assertEqual(self.signature(Foo.__call__),
+ ((('a', ..., ..., "positional_or_keyword"),
+ ('b', ..., ..., "positional_or_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(Foo().__call__),
+ ((('b', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ def test_signature_on_class(self):
+ class C:
+ def __init__(self, a):
+ pass
+
+ self.assertEqual(self.signature(C),
+ ((('a', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ class CM(type):
+ def __call__(cls, a):
+ pass
+ class C(metaclass=CM):
+ def __init__(self, b):
+ pass
+
+ self.assertEqual(self.signature(C),
+ ((('a', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ class CM(type):
+ def __new__(mcls, name, bases, dct, *, foo=1):
+ return super().__new__(mcls, name, bases, dct)
+ class C(metaclass=CM):
+ def __init__(self, b):
+ pass
+
+ self.assertEqual(self.signature(C),
+ ((('b', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ self.assertEqual(self.signature(CM),
+ ((('name', ..., ..., "positional_or_keyword"),
+ ('bases', ..., ..., "positional_or_keyword"),
+ ('dct', ..., ..., "positional_or_keyword"),
+ ('foo', 1, ..., "keyword_only")),
+ ...))
+
+ class CMM(type):
+ def __new__(mcls, name, bases, dct, *, foo=1):
+ return super().__new__(mcls, name, bases, dct)
+ def __call__(cls, nm, bs, dt):
+ return type(nm, bs, dt)
+ class CM(type, metaclass=CMM):
+ def __new__(mcls, name, bases, dct, *, bar=2):
+ return super().__new__(mcls, name, bases, dct)
+ class C(metaclass=CM):
+ def __init__(self, b):
+ pass
+
+ self.assertEqual(self.signature(CMM),
+ ((('name', ..., ..., "positional_or_keyword"),
+ ('bases', ..., ..., "positional_or_keyword"),
+ ('dct', ..., ..., "positional_or_keyword"),
+ ('foo', 1, ..., "keyword_only")),
+ ...))
+
+ self.assertEqual(self.signature(CM),
+ ((('nm', ..., ..., "positional_or_keyword"),
+ ('bs', ..., ..., "positional_or_keyword"),
+ ('dt', ..., ..., "positional_or_keyword")),
+ ...))
+
+ self.assertEqual(self.signature(C),
+ ((('b', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ class CM(type):
+ def __init__(cls, name, bases, dct, *, bar=2):
+ return super().__init__(name, bases, dct)
+ class C(metaclass=CM):
+ def __init__(self, b):
+ pass
+
+ self.assertEqual(self.signature(CM),
+ ((('name', ..., ..., "positional_or_keyword"),
+ ('bases', ..., ..., "positional_or_keyword"),
+ ('dct', ..., ..., "positional_or_keyword"),
+ ('bar', 2, ..., "keyword_only")),
+ ...))
+
+ def test_signature_on_callable_objects(self):
+ class Foo:
+ def __call__(self, a):
+ pass
+
+ self.assertEqual(self.signature(Foo()),
+ ((('a', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ class Spam:
+ pass
+ with self.assertRaisesRegexp(TypeError, "is not a callable object"):
+ inspect.signature(Spam())
+
+ class Bar(Spam, Foo):
+ pass
+
+ self.assertEqual(self.signature(Bar()),
+ ((('a', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ class ToFail:
+ __call__ = type
+ with self.assertRaisesRegexp(ValueError, "not supported by signature"):
+ inspect.signature(ToFail())
+
+
+ class Wrapped:
+ pass
+ Wrapped.__wrapped__ = lambda a: None
+ self.assertEqual(self.signature(Wrapped),
+ ((('a', ..., ..., "positional_or_keyword"),),
+ ...))
+
+ def test_signature_on_lambdas(self):
+ self.assertEqual(self.signature((lambda a=10: a)),
+ ((('a', 10, ..., "positional_or_keyword"),),
+ ...))
+
+ def test_signature_equality(self):
+ def foo(a, *, b:int) -> float: pass
+ self.assertNotEqual(inspect.signature(foo), 42)
+
+ def bar(a, *, b:int) -> float: pass
+ self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def bar(a, *, b:int) -> int: pass
+ self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def bar(a, *, b:int): pass
+ self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def bar(a, *, b:int=42) -> float: pass
+ self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def bar(a, *, c) -> float: pass
+ self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def bar(a, b:int) -> float: pass
+ self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+ def spam(b:int, a) -> float: pass
+ self.assertNotEqual(inspect.signature(spam), inspect.signature(bar))
+
+ def foo(*, a, b, c): pass
+ def bar(*, c, b, a): pass
+ self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def foo(*, a=1, b, c): pass
+ def bar(*, c, b, a=1): pass
+ self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def foo(pos, *, a=1, b, c): pass
+ def bar(pos, *, c, b, a=1): pass
+ self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def foo(pos, *, a, b, c): pass
+ def bar(pos, *, c, b, a=1): pass
+ self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def foo(pos, *args, a=42, b, c, **kwargs:int): pass
+ def bar(pos, *args, c, b, a=42, **kwargs:int): pass
+ self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+
+ def test_signature_unhashable(self):
+ def foo(a): pass
+ sig = inspect.signature(foo)
+ with self.assertRaisesRegexp(TypeError, 'unhashable type'):
+ hash(sig)
+
+ def test_signature_str(self):
+ def foo(a:int=1, *, b, c=None, **kwargs) -> 42:
+ pass
+ self.assertEqual(str(inspect.signature(foo)),
+ '(a:int=1, *, b, c=None, **kwargs) -> 42')
+
+ def foo(a:int=1, *args, b, c=None, **kwargs) -> 42:
+ pass
+ self.assertEqual(str(inspect.signature(foo)),
+ '(a:int=1, *args, b, c=None, **kwargs) -> 42')
+
+ def foo():
+ pass
+ self.assertEqual(str(inspect.signature(foo)), '()')
+
+ def test_signature_str_positional_only(self):
+ P = inspect.Parameter
+
+ def test(a_po, *, b, **kwargs):
+ return a_po, kwargs
+
+ sig = inspect.signature(test)
+ new_params = list(sig.parameters.values())
+ new_params[0] = new_params[0].replace(kind=P.POSITIONAL_ONLY)
+ test.__signature__ = sig.replace(parameters=new_params)
+
+ self.assertEqual(str(inspect.signature(test)),
+ '(<a_po>, *, b, **kwargs)')
+
+ sig = inspect.signature(test)
+ new_params = list(sig.parameters.values())
+ new_params[0] = new_params[0].replace(name=None)
+ test.__signature__ = sig.replace(parameters=new_params)
+ self.assertEqual(str(inspect.signature(test)),
+ '(<0>, *, b, **kwargs)')
+
+ def test_signature_replace_anno(self):
+ def test() -> 42:
+ pass
+
+ sig = inspect.signature(test)
+ sig = sig.replace(return_annotation=None)
+ self.assertIs(sig.return_annotation, None)
+ sig = sig.replace(return_annotation=sig.empty)
+ self.assertIs(sig.return_annotation, sig.empty)
+ sig = sig.replace(return_annotation=42)
+ self.assertEqual(sig.return_annotation, 42)
+ self.assertEqual(sig, inspect.signature(test))
+
+
+class TestParameterObject(unittest.TestCase):
+ def test_signature_parameter_kinds(self):
+ P = inspect.Parameter
+ self.assertTrue(P.POSITIONAL_ONLY < P.POSITIONAL_OR_KEYWORD < \
+ P.VAR_POSITIONAL < P.KEYWORD_ONLY < P.VAR_KEYWORD)
+
+ self.assertEqual(str(P.POSITIONAL_ONLY), 'POSITIONAL_ONLY')
+ self.assertTrue('POSITIONAL_ONLY' in repr(P.POSITIONAL_ONLY))
+
+ def test_signature_parameter_object(self):
+ p = inspect.Parameter('foo', default=10,
+ kind=inspect.Parameter.POSITIONAL_ONLY)
+ self.assertEqual(p.name, 'foo')
+ self.assertEqual(p.default, 10)
+ self.assertIs(p.annotation, p.empty)
+ self.assertEqual(p.kind, inspect.Parameter.POSITIONAL_ONLY)
+
+ with self.assertRaisesRegexp(ValueError, 'invalid value'):
+ inspect.Parameter('foo', default=10, kind='123')
+
+ with self.assertRaisesRegexp(ValueError, 'not a valid parameter name'):
+ inspect.Parameter('1', kind=inspect.Parameter.VAR_KEYWORD)
+
+ with self.assertRaisesRegexp(ValueError,
+ 'non-positional-only parameter'):
+ inspect.Parameter(None, kind=inspect.Parameter.VAR_KEYWORD)
+
+ with self.assertRaisesRegexp(ValueError, 'cannot have default values'):
+ inspect.Parameter('a', default=42,
+ kind=inspect.Parameter.VAR_KEYWORD)
+
+ with self.assertRaisesRegexp(ValueError, 'cannot have default values'):
+ inspect.Parameter('a', default=42,
+ kind=inspect.Parameter.VAR_POSITIONAL)
+
+ p = inspect.Parameter('a', default=42,
+ kind=inspect.Parameter.POSITIONAL_OR_KEYWORD)
+ with self.assertRaisesRegexp(ValueError, 'cannot have default values'):
+ p.replace(kind=inspect.Parameter.VAR_POSITIONAL)
+
+ self.assertTrue(repr(p).startswith('<Parameter'))
+
+ def test_signature_parameter_equality(self):
+ P = inspect.Parameter
+ p = P('foo', default=42, kind=inspect.Parameter.KEYWORD_ONLY)
+
+ self.assertEqual(p, p)
+ self.assertNotEqual(p, 42)
+
+ self.assertEqual(p, P('foo', default=42,
+ kind=inspect.Parameter.KEYWORD_ONLY))
+
+ def test_signature_parameter_unhashable(self):
+ p = inspect.Parameter('foo', default=42,
+ kind=inspect.Parameter.KEYWORD_ONLY)
+
+ with self.assertRaisesRegexp(TypeError, 'unhashable type'):
+ hash(p)
+
+ def test_signature_parameter_replace(self):
+ p = inspect.Parameter('foo', default=42,
+ kind=inspect.Parameter.KEYWORD_ONLY)
+
+ self.assertIsNot(p, p.replace())
+ self.assertEqual(p, p.replace())
+
+ p2 = p.replace(annotation=1)
+ self.assertEqual(p2.annotation, 1)
+ p2 = p2.replace(annotation=p2.empty)
+ self.assertEqual(p, p2)
+
+ p2 = p2.replace(name='bar')
+ self.assertEqual(p2.name, 'bar')
+ self.assertNotEqual(p2, p)
+
+ with self.assertRaisesRegexp(ValueError, 'not a valid parameter name'):
+ p2 = p2.replace(name=p2.empty)
+
+ p2 = p2.replace(name='foo', default=None)
+ self.assertIs(p2.default, None)
+ self.assertNotEqual(p2, p)
+
+ p2 = p2.replace(name='foo', default=p2.empty)
+ self.assertIs(p2.default, p2.empty)
+
+
+ p2 = p2.replace(default=42, kind=p2.POSITIONAL_OR_KEYWORD)
+ self.assertEqual(p2.kind, p2.POSITIONAL_OR_KEYWORD)
+ self.assertNotEqual(p2, p)
+
+ with self.assertRaisesRegexp(ValueError, 'invalid value for'):
+ p2 = p2.replace(kind=p2.empty)
+
+ p2 = p2.replace(kind=p2.KEYWORD_ONLY)
+ self.assertEqual(p2, p)
+
+ def test_signature_parameter_positional_only(self):
+ p = inspect.Parameter(None, kind=inspect.Parameter.POSITIONAL_ONLY)
+ self.assertEqual(str(p), '<>')
+
+ p = p.replace(name='1')
+ self.assertEqual(str(p), '<1>')
+
+ def test_signature_parameter_immutability(self):
+ p = inspect.Parameter(None, kind=inspect.Parameter.POSITIONAL_ONLY)
+
+ with self.assertRaises(AttributeError):
+ p.foo = 'bar'
+
+ with self.assertRaises(AttributeError):
+ p.kind = 123
+
+
+class TestSignatureBind(unittest.TestCase):
+ @staticmethod
+ def call(func, *args, **kwargs):
+ sig = inspect.signature(func)
+ ba = sig.bind(*args, **kwargs)
+ return func(*ba.args, **ba.kwargs)
+
+ def test_signature_bind_empty(self):
+ def test():
+ return 42
+
+ self.assertEqual(self.call(test), 42)
+ with self.assertRaisesRegexp(TypeError, 'too many positional arguments'):
+ self.call(test, 1)
+ with self.assertRaisesRegexp(TypeError, 'too many positional arguments'):
+ self.call(test, 1, spam=10)
+ with self.assertRaisesRegexp(TypeError, 'too many keyword arguments'):
+ self.call(test, spam=1)
+
+ def test_signature_bind_var(self):
+ def test(*args, **kwargs):
+ return args, kwargs
+
+ self.assertEqual(self.call(test), ((), {}))
+ self.assertEqual(self.call(test, 1), ((1,), {}))
+ self.assertEqual(self.call(test, 1, 2), ((1, 2), {}))
+ self.assertEqual(self.call(test, foo='bar'), ((), {'foo': 'bar'}))
+ self.assertEqual(self.call(test, 1, foo='bar'), ((1,), {'foo': 'bar'}))
+ self.assertEqual(self.call(test, args=10), ((), {'args': 10}))
+ self.assertEqual(self.call(test, 1, 2, foo='bar'),
+ ((1, 2), {'foo': 'bar'}))
+
+ def test_signature_bind_just_args(self):
+ def test(a, b, c):
+ return a, b, c
+
+ self.assertEqual(self.call(test, 1, 2, 3), (1, 2, 3))
+
+ with self.assertRaisesRegexp(TypeError, 'too many positional arguments'):
+ self.call(test, 1, 2, 3, 4)
+
+ with self.assertRaisesRegexp(TypeError, "'b' parameter lacking default"):
+ self.call(test, 1)
+
+ with self.assertRaisesRegexp(TypeError, "'a' parameter lacking default"):
+ self.call(test)
+
+ def test(a, b, c=10):
+ return a, b, c
+ self.assertEqual(self.call(test, 1, 2, 3), (1, 2, 3))
+ self.assertEqual(self.call(test, 1, 2), (1, 2, 10))
+
+ def test(a=1, b=2, c=3):
+ return a, b, c
+ self.assertEqual(self.call(test, a=10, c=13), (10, 2, 13))
+ self.assertEqual(self.call(test, a=10), (10, 2, 3))
+ self.assertEqual(self.call(test, b=10), (1, 10, 3))
+
+ def test_signature_bind_varargs_order(self):
+ def test(*args):
+ return args
+
+ self.assertEqual(self.call(test), ())
+ self.assertEqual(self.call(test, 1, 2, 3), (1, 2, 3))
+
+ def test_signature_bind_args_and_varargs(self):
+ def test(a, b, c=3, *args):
+ return a, b, c, args
+
+ self.assertEqual(self.call(test, 1, 2, 3, 4, 5), (1, 2, 3, (4, 5)))
+ self.assertEqual(self.call(test, 1, 2), (1, 2, 3, ()))
+ self.assertEqual(self.call(test, b=1, a=2), (2, 1, 3, ()))
+ self.assertEqual(self.call(test, 1, b=2), (1, 2, 3, ()))
+
+ with self.assertRaisesRegexp(TypeError,
+ "multiple values for argument 'c'"):
+ self.call(test, 1, 2, 3, c=4)
+
+ def test_signature_bind_just_kwargs(self):
+ def test(**kwargs):
+ return kwargs
+
+ self.assertEqual(self.call(test), {})
+ self.assertEqual(self.call(test, foo='bar', spam='ham'),
+ {'foo': 'bar', 'spam': 'ham'})
+
+ def test_signature_bind_args_and_kwargs(self):
+ def test(a, b, c=3, **kwargs):
+ return a, b, c, kwargs
+
+ self.assertEqual(self.call(test, 1, 2), (1, 2, 3, {}))
+ self.assertEqual(self.call(test, 1, 2, foo='bar', spam='ham'),
+ (1, 2, 3, {'foo': 'bar', 'spam': 'ham'}))
+ self.assertEqual(self.call(test, b=2, a=1, foo='bar', spam='ham'),
+ (1, 2, 3, {'foo': 'bar', 'spam': 'ham'}))
+ self.assertEqual(self.call(test, a=1, b=2, foo='bar', spam='ham'),
+ (1, 2, 3, {'foo': 'bar', 'spam': 'ham'}))
+ self.assertEqual(self.call(test, 1, b=2, foo='bar', spam='ham'),
+ (1, 2, 3, {'foo': 'bar', 'spam': 'ham'}))
+ self.assertEqual(self.call(test, 1, b=2, c=4, foo='bar', spam='ham'),
+ (1, 2, 4, {'foo': 'bar', 'spam': 'ham'}))
+ self.assertEqual(self.call(test, 1, 2, 4, foo='bar'),
+ (1, 2, 4, {'foo': 'bar'}))
+ self.assertEqual(self.call(test, c=5, a=4, b=3),
+ (4, 3, 5, {}))
+
+ def test_signature_bind_kwonly(self):
+ def test(*, foo):
+ return foo
+ with self.assertRaisesRegexp(TypeError,
+ 'too many positional arguments'):
+ self.call(test, 1)
+ self.assertEqual(self.call(test, foo=1), 1)
+
+ def test(a, *, foo=1, bar):
+ return foo
+ with self.assertRaisesRegexp(TypeError,
+ "'bar' parameter lacking default value"):
+ self.call(test, 1)
+
+ def test(foo, *, bar):
+ return foo, bar
+ self.assertEqual(self.call(test, 1, bar=2), (1, 2))
+ self.assertEqual(self.call(test, bar=2, foo=1), (1, 2))
+
+ with self.assertRaisesRegexp(TypeError,
+ 'too many keyword arguments'):
+ self.call(test, bar=2, foo=1, spam=10)
+
+ with self.assertRaisesRegexp(TypeError,
+ 'too many positional arguments'):
+ self.call(test, 1, 2)
+
+ with self.assertRaisesRegexp(TypeError,
+ 'too many positional arguments'):
+ self.call(test, 1, 2, bar=2)
+
+ with self.assertRaisesRegexp(TypeError,
+ 'too many keyword arguments'):
+ self.call(test, 1, bar=2, spam='ham')
+
+ with self.assertRaisesRegexp(TypeError,
+ "'bar' parameter lacking default value"):
+ self.call(test, 1)
+
+ def test(foo, *, bar, **bin):
+ return foo, bar, bin
+ self.assertEqual(self.call(test, 1, bar=2), (1, 2, {}))
+ self.assertEqual(self.call(test, foo=1, bar=2), (1, 2, {}))
+ self.assertEqual(self.call(test, 1, bar=2, spam='ham'),
+ (1, 2, {'spam': 'ham'}))
+ self.assertEqual(self.call(test, spam='ham', foo=1, bar=2),
+ (1, 2, {'spam': 'ham'}))
+ with self.assertRaisesRegexp(TypeError,
+ "'foo' parameter lacking default value"):
+ self.call(test, spam='ham', bar=2)
+ self.assertEqual(self.call(test, 1, bar=2, bin=1, spam=10),
+ (1, 2, {'bin': 1, 'spam': 10}))
+
+ def test_signature_bind_arguments(self):
+ def test(a, *args, b, z=100, **kwargs):
+ pass
+ sig = inspect.signature(test)
+ ba = sig.bind(10, 20, b=30, c=40, args=50, kwargs=60)
+ # we won't have 'z' argument in the bound arguments object, as we didn't
+ # pass it to the 'bind'
+ self.assertEqual(tuple(ba.arguments.items()),
+ (('a', 10), ('args', (20,)), ('b', 30),
+ ('kwargs', {'c': 40, 'args': 50, 'kwargs': 60})))
+ self.assertEqual(ba.kwargs,
+ {'b': 30, 'c': 40, 'args': 50, 'kwargs': 60})
+ self.assertEqual(ba.args, (10, 20))
+
+ def test_signature_bind_positional_only(self):
+ P = inspect.Parameter
+
+ def test(a_po, b_po, c_po=3, foo=42, *, bar=50, **kwargs):
+ return a_po, b_po, c_po, foo, bar, kwargs
+
+ sig = inspect.signature(test)
+ new_params = collections.OrderedDict(tuple(sig.parameters.items()))
+ for name in ('a_po', 'b_po', 'c_po'):
+ new_params[name] = new_params[name].replace(kind=P.POSITIONAL_ONLY)
+ new_sig = sig.replace(parameters=new_params.values())
+ test.__signature__ = new_sig
+
+ self.assertEqual(self.call(test, 1, 2, 4, 5, bar=6),
+ (1, 2, 4, 5, 6, {}))
+
+ with self.assertRaisesRegexp(TypeError, "parameter is positional only"):
+ self.call(test, 1, 2, c_po=4)
+
+ with self.assertRaisesRegexp(TypeError, "parameter is positional only"):
+ self.call(test, a_po=1, b_po=2)
+
+
+class TestBoundArguments(unittest.TestCase):
+ def test_signature_bound_arguments_unhashable(self):
+ def foo(a): pass
+ ba = inspect.signature(foo).bind(1)
+
+ with self.assertRaisesRegexp(TypeError, 'unhashable type'):
+ hash(ba)
+
+ def test_signature_bound_arguments_equality(self):
+ def foo(a): pass
+ ba = inspect.signature(foo).bind(1)
+ self.assertEqual(ba, ba)
+
+ ba2 = inspect.signature(foo).bind(1)
+ self.assertEqual(ba, ba2)
+
+ ba3 = inspect.signature(foo).bind(2)
+ self.assertNotEqual(ba, ba3)
+ ba3.arguments['a'] = 1
+ self.assertEqual(ba, ba3)
+
+ def bar(b): pass
+ ba4 = inspect.signature(bar).bind(1)
+ self.assertNotEqual(ba, ba4)
+
+
def test_main():
run_unittest(
TestDecorators, TestRetrievingSourceCode, TestOneliners, TestBuggyCases,
TestInterpreterStack, TestClassesAndFunctions, TestPredicates,
TestGetcallargsFunctions, TestGetcallargsMethods,
TestGetcallargsUnboundMethods, TestGetattrStatic, TestGetGeneratorState,
- TestNoEOL
+ TestNoEOL, TestSignatureObject, TestSignatureBind, TestParameterObject,
+ TestBoundArguments
)
if __name__ == "__main__":