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import textwrap
import unittest
class TypeAnnotationTests(unittest.TestCase):
def test_lazy_create_annotations(self):
# type objects lazy create their __annotations__ dict on demand.
# the annotations dict is stored in type.__dict__.
# a freshly created type shouldn't have an annotations dict yet.
foo = type("Foo", (), {})
for i in range(3):
self.assertFalse("__annotations__" in foo.__dict__)
d = foo.__annotations__
self.assertTrue("__annotations__" in foo.__dict__)
self.assertEqual(foo.__annotations__, d)
self.assertEqual(foo.__dict__['__annotations__'], d)
del foo.__annotations__
def test_setting_annotations(self):
foo = type("Foo", (), {})
for i in range(3):
self.assertFalse("__annotations__" in foo.__dict__)
d = {'a': int}
foo.__annotations__ = d
self.assertTrue("__annotations__" in foo.__dict__)
self.assertEqual(foo.__annotations__, d)
self.assertEqual(foo.__dict__['__annotations__'], d)
del foo.__annotations__
def test_annotations_getset_raises(self):
# builtin types don't have __annotations__ (yet!)
with self.assertRaises(AttributeError):
print(float.__annotations__)
with self.assertRaises(TypeError):
float.__annotations__ = {}
with self.assertRaises(TypeError):
del float.__annotations__
# double delete
foo = type("Foo", (), {})
foo.__annotations__ = {}
del foo.__annotations__
with self.assertRaises(AttributeError):
del foo.__annotations__
def test_annotations_are_created_correctly(self):
class C:
a:int=3
b:str=4
self.assertTrue("__annotations__" in C.__dict__)
del C.__annotations__
self.assertFalse("__annotations__" in C.__dict__)
def test_descriptor_still_works(self):
class C:
def __init__(self, name=None, bases=None, d=None):
self.my_annotations = None
@property
def __annotations__(self):
if not hasattr(self, 'my_annotations'):
self.my_annotations = {}
if not isinstance(self.my_annotations, dict):
self.my_annotations = {}
return self.my_annotations
@__annotations__.setter
def __annotations__(self, value):
if not isinstance(value, dict):
raise ValueError("can only set __annotations__ to a dict")
self.my_annotations = value
@__annotations__.deleter
def __annotations__(self):
if getattr(self, 'my_annotations', False) is None:
raise AttributeError('__annotations__')
self.my_annotations = None
c = C()
self.assertEqual(c.__annotations__, {})
d = {'a':'int'}
c.__annotations__ = d
self.assertEqual(c.__annotations__, d)
with self.assertRaises(ValueError):
c.__annotations__ = 123
del c.__annotations__
with self.assertRaises(AttributeError):
del c.__annotations__
self.assertEqual(c.__annotations__, {})
class D(metaclass=C):
pass
self.assertEqual(D.__annotations__, {})
d = {'a':'int'}
D.__annotations__ = d
self.assertEqual(D.__annotations__, d)
with self.assertRaises(ValueError):
D.__annotations__ = 123
del D.__annotations__
with self.assertRaises(AttributeError):
del D.__annotations__
self.assertEqual(D.__annotations__, {})
class TestSetupAnnotations(unittest.TestCase):
def check(self, code: str):
code = textwrap.dedent(code)
for scope in ("module", "class"):
with self.subTest(scope=scope):
if scope == "class":
code = f"class C:\n{textwrap.indent(code, ' ')}"
ns = {}
exec(code, ns)
if scope == "class":
annotations = ns["C"].__annotations__
else:
annotations = ns["__annotations__"]
self.assertEqual(annotations, {"x": int})
def test_top_level(self):
self.check("x: int = 1")
def test_blocks(self):
self.check("if True:\n x: int = 1")
self.check("""
while True:
x: int = 1
break
""")
self.check("""
while False:
pass
else:
x: int = 1
""")
self.check("""
for i in range(1):
x: int = 1
""")
self.check("""
for i in range(1):
pass
else:
x: int = 1
""")
def test_try(self):
self.check("""
try:
x: int = 1
except:
pass
""")
self.check("""
try:
pass
except:
pass
else:
x: int = 1
""")
self.check("""
try:
pass
except:
pass
finally:
x: int = 1
""")
self.check("""
try:
1/0
except:
x: int = 1
""")
def test_try_star(self):
self.check("""
try:
x: int = 1
except* Exception:
pass
""")
self.check("""
try:
pass
except* Exception:
pass
else:
x: int = 1
""")
self.check("""
try:
pass
except* Exception:
pass
finally:
x: int = 1
""")
self.check("""
try:
1/0
except* Exception:
x: int = 1
""")
def test_match(self):
self.check("""
match 0:
case 0:
x: int = 1
""")
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