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Copy pathtest_type_annotations.py
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914 lines (812 loc) · 29.5 KB
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import annotationlib
import inspect
import itertools
import textwrap
import types
import unittest
from test.support import run_code, check_syntax_error, import_helper, cpython_only
from test.test_inspect import inspect_stringized_annotations
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__ (as __annotations_cache__).
# a freshly created type shouldn't have an annotations dict yet.
foo = type("Foo", (), {})
for i in range(3):
self.assertFalse("__annotations_cache__" in foo.__dict__)
d = foo.__annotations__
self.assertTrue("__annotations_cache__" in foo.__dict__)
self.assertEqual(foo.__annotations__, d)
self.assertEqual(foo.__dict__['__annotations_cache__'], d)
del foo.__annotations__
def test_setting_annotations(self):
foo = type("Foo", (), {})
for i in range(3):
self.assertFalse("__annotations_cache__" in foo.__dict__)
d = {'a': int}
foo.__annotations__ = d
self.assertTrue("__annotations_cache__" in foo.__dict__)
self.assertEqual(foo.__annotations__, d)
self.assertEqual(foo.__dict__['__annotations_cache__'], 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.assertEqual(C.__annotations__, {"a": int, "b": str})
self.assertTrue("__annotations_cache__" in C.__dict__)
del C.__annotations__
self.assertFalse("__annotations_cache__" in C.__dict__)
def test_pep563_annotations(self):
isa = inspect_stringized_annotations
self.assertEqual(
isa.__annotations__, {"a": "int", "b": "str"},
)
self.assertEqual(
isa.MyClass.__annotations__, {"a": "int", "b": "str"},
)
def test_explicitly_set_annotations(self):
class C:
__annotations__ = {"what": int}
self.assertEqual(C.__annotations__, {"what": int})
def test_explicitly_set_annotate(self):
class C:
__annotate__ = lambda format: {"what": int}
self.assertEqual(C.__annotations__, {"what": int})
self.assertIsInstance(C.__annotate__, types.FunctionType)
self.assertEqual(C.__annotate__(annotationlib.Format.VALUE), {"what": int})
def test_del_annotations_and_annotate(self):
# gh-132285
called = False
class A:
def __annotate__(format):
nonlocal called
called = True
return {'a': int}
self.assertEqual(A.__annotations__, {'a': int})
self.assertTrue(called)
self.assertTrue(A.__annotate__)
del A.__annotations__
called = False
self.assertEqual(A.__annotations__, {})
self.assertFalse(called)
self.assertIs(A.__annotate__, None)
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__, {})
def test_partially_executed_module(self):
partialexe = import_helper.import_fresh_module("test.typinganndata.partialexecution")
self.assertEqual(
partialexe.a.__annotations__,
{"v1": int, "v2": int},
)
self.assertEqual(partialexe.b.annos, {"v1": int})
@cpython_only
def test_no_cell(self):
# gh-130924: Test that uses of annotations in local scopes do not
# create cell variables.
def f(x):
a: x
return x
self.assertEqual(f.__code__.co_cellvars, ())
def build_module(code: str, name: str = "top") -> types.ModuleType:
ns = run_code(code)
mod = types.ModuleType(name)
mod.__dict__.update(ns)
return mod
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 = run_code(code)
annotations = ns["C"].__annotations__
else:
annotations = build_module(code).__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
""")
class AnnotateTests(unittest.TestCase):
"""See PEP 649."""
def test_manual_annotate(self):
def f():
pass
mod = types.ModuleType("mod")
class X:
pass
for obj in (f, mod, X):
with self.subTest(obj=obj):
self.check_annotations(obj)
def check_annotations(self, f):
self.assertEqual(f.__annotations__, {})
self.assertIs(f.__annotate__, None)
with self.assertRaisesRegex(TypeError, "__annotate__ must be callable or None"):
f.__annotate__ = 42
f.__annotate__ = lambda: 42
with self.assertRaisesRegex(TypeError, r"takes 0 positional arguments but 1 was given"):
print(f.__annotations__)
f.__annotate__ = lambda x: 42
with self.assertRaisesRegex(TypeError, r"__annotate__\(\) must return a dict, not int"):
print(f.__annotations__)
f.__annotate__ = lambda x: {"x": x}
self.assertEqual(f.__annotations__, {"x": 1})
# Setting annotate to None does not invalidate the cached __annotations__
f.__annotate__ = None
self.assertEqual(f.__annotations__, {"x": 1})
# But setting it to a new callable does
f.__annotate__ = lambda x: {"y": x}
self.assertEqual(f.__annotations__, {"y": 1})
# Setting f.__annotations__ also clears __annotate__
f.__annotations__ = {"z": 43}
self.assertIs(f.__annotate__, None)
def test_user_defined_annotate(self):
class X:
a: int
def __annotate__(format):
return {"a": str}
self.assertEqual(X.__annotate__(annotationlib.Format.VALUE), {"a": str})
self.assertEqual(annotationlib.get_annotations(X), {"a": str})
mod = build_module(
"""
a: int
def __annotate__(format):
return {"a": str}
"""
)
self.assertEqual(mod.__annotate__(annotationlib.Format.VALUE), {"a": str})
self.assertEqual(annotationlib.get_annotations(mod), {"a": str})
class DeferredEvaluationTests(unittest.TestCase):
def test_function(self):
def func(x: undefined, /, y: undefined, *args: undefined, z: undefined, **kwargs: undefined) -> undefined:
pass
with self.assertRaises(NameError):
func.__annotations__
undefined = 1
self.assertEqual(func.__annotations__, {
"x": 1,
"y": 1,
"args": 1,
"z": 1,
"kwargs": 1,
"return": 1,
})
def test_async_function(self):
async def func(x: undefined, /, y: undefined, *args: undefined, z: undefined, **kwargs: undefined) -> undefined:
pass
with self.assertRaises(NameError):
func.__annotations__
undefined = 1
self.assertEqual(func.__annotations__, {
"x": 1,
"y": 1,
"args": 1,
"z": 1,
"kwargs": 1,
"return": 1,
})
def test_class(self):
class X:
a: undefined
with self.assertRaises(NameError):
X.__annotations__
undefined = 1
self.assertEqual(X.__annotations__, {"a": 1})
def test_module(self):
ns = run_code("x: undefined = 1")
anno = ns["__annotate__"]
with self.assertRaises(NotImplementedError):
anno(3)
with self.assertRaises(NameError):
anno(1)
ns["undefined"] = 1
self.assertEqual(anno(1), {"x": 1})
def test_class_scoping(self):
class Outer:
def meth(self, x: Nested): ...
x: Nested
class Nested: ...
self.assertEqual(Outer.meth.__annotations__, {"x": Outer.Nested})
self.assertEqual(Outer.__annotations__, {"x": Outer.Nested})
def test_no_exotic_expressions(self):
preludes = [
"",
"class X:\n ",
"def f():\n ",
"async def f():\n ",
]
for prelude in preludes:
with self.subTest(prelude=prelude):
check_syntax_error(self, prelude + "def func(x: (yield)): ...", "yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: (yield from x)): ...", "yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: (y := 3)): ...", "named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: (await 42)): ...", "await expression cannot be used within an annotation")
check_syntax_error(self, prelude + "def func(x: [y async for y in x]): ...", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "def func(x: {y async for y in x}): ...", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "def func(x: {y: y async for y in x}): ...", "asynchronous comprehension outside of an asynchronous function")
def test_no_exotic_expressions_in_unevaluated_annotations(self):
preludes = [
"",
"class X: ",
"def f(): ",
"async def f(): ",
]
for prelude in preludes:
with self.subTest(prelude=prelude):
check_syntax_error(self, prelude + "(x): (yield)", "yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (yield from x)", "yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (y := 3)", "named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (__debug__ := 3)", "named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (await 42)", "await expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): [y async for y in x]", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "(x): {y async for y in x}", "asynchronous comprehension outside of an asynchronous function")
check_syntax_error(self, prelude + "(x): {y: y async for y in x}", "asynchronous comprehension outside of an asynchronous function")
def test_ignore_non_simple_annotations(self):
ns = run_code("class X: (y): int")
self.assertEqual(ns["X"].__annotations__, {})
ns = run_code("class X: int.b: int")
self.assertEqual(ns["X"].__annotations__, {})
ns = run_code("class X: int[str]: int")
self.assertEqual(ns["X"].__annotations__, {})
def test_generated_annotate(self):
def func(x: int):
pass
class X:
x: int
mod = build_module("x: int")
for obj in (func, X, mod):
with self.subTest(obj=obj):
annotate = obj.__annotate__
self.assertIsInstance(annotate, types.FunctionType)
self.assertEqual(annotate.__name__, "__annotate__")
with self.assertRaises(NotImplementedError):
annotate(annotationlib.Format.FORWARDREF)
with self.assertRaises(NotImplementedError):
annotate(annotationlib.Format.STRING)
with self.assertRaises(TypeError):
annotate(None)
self.assertEqual(annotate(annotationlib.Format.VALUE), {"x": int})
sig = inspect.signature(annotate)
self.assertEqual(sig, inspect.Signature([
inspect.Parameter("format", inspect.Parameter.POSITIONAL_ONLY)
]))
def test_comprehension_in_annotation(self):
# This crashed in an earlier version of the code
ns = run_code("x: [y for y in range(10)]")
self.assertEqual(ns["__annotate__"](1), {"x": list(range(10))})
def test_class_annotation_dunder_classdict(self):
ns = run_code("""
class C:
__classdict__: int
""")
self.assertEqual(ns["C"].__annotations__, {"__classdict__": int})
def test_future_annotations(self):
code = """
from __future__ import annotations
def f(x: int) -> int: pass
"""
ns = run_code(code)
f = ns["f"]
self.assertIsInstance(f.__annotate__, types.FunctionType)
annos = {"x": "int", "return": "int"}
self.assertEqual(f.__annotate__(annotationlib.Format.VALUE), annos)
self.assertEqual(f.__annotations__, annos)
def test_set_annotations(self):
function_code = textwrap.dedent("""
def f(x: int):
pass
""")
class_code = textwrap.dedent("""
class f:
x: int
""")
for future in (False, True):
for label, code in (("function", function_code), ("class", class_code)):
with self.subTest(future=future, label=label):
if future:
code = "from __future__ import annotations\n" + code
ns = run_code(code)
f = ns["f"]
anno = "int" if future else int
self.assertEqual(f.__annotations__, {"x": anno})
f.__annotations__ = {"x": str}
self.assertEqual(f.__annotations__, {"x": str})
def test_name_clash_with_format(self):
# this test would fail if __annotate__'s parameter was called "format"
# during symbol table construction
code = """
class format: pass
def f(x: format): pass
"""
ns = run_code(code)
f = ns["f"]
self.assertEqual(f.__annotations__, {"x": ns["format"]})
code = """
class Outer:
class format: pass
def meth(self, x: format): ...
"""
ns = run_code(code)
self.assertEqual(ns["Outer"].meth.__annotations__, {"x": ns["Outer"].format})
code = """
def f(format):
def inner(x: format): pass
return inner
res = f("closure var")
"""
ns = run_code(code)
self.assertEqual(ns["res"].__annotations__, {"x": "closure var"})
code = """
def f(x: format):
pass
"""
ns = run_code(code)
# picks up the format() builtin
self.assertEqual(ns["f"].__annotations__, {"x": format})
code = """
def outer():
def f(x: format):
pass
if False:
class format: pass
return f
f = outer()
"""
ns = run_code(code)
with self.assertRaisesRegex(
NameError,
"cannot access free variable 'format' where it is not associated with a value in enclosing scope",
):
ns["f"].__annotations__
class ConditionalAnnotationTests(unittest.TestCase):
def check_scopes(self, code, true_annos, false_annos):
for scope in ("class", "module"):
for (cond, expected) in (
# Constants (so code might get optimized out)
(True, true_annos), (False, false_annos),
# Non-constant expressions
("not not len", true_annos), ("not len", false_annos),
):
with self.subTest(scope=scope, cond=cond):
code_to_run = code.format(cond=cond)
if scope == "class":
code_to_run = "class Cls:\n" + textwrap.indent(textwrap.dedent(code_to_run), " " * 4)
ns = run_code(code_to_run)
if scope == "class":
self.assertEqual(ns["Cls"].__annotations__, expected)
else:
self.assertEqual(ns["__annotate__"](annotationlib.Format.VALUE),
expected)
def test_with(self):
code = """
class Swallower:
def __enter__(self):
pass
def __exit__(self, *args):
return True
with Swallower():
if {cond}:
about_to_raise: int
raise Exception
in_with: "with"
"""
self.check_scopes(code, {"about_to_raise": int}, {"in_with": "with"})
def test_simple_if(self):
code = """
if {cond}:
in_if: "if"
else:
in_if: "else"
"""
self.check_scopes(code, {"in_if": "if"}, {"in_if": "else"})
def test_if_elif(self):
code = """
if not len:
in_if: "if"
elif {cond}:
in_elif: "elif"
else:
in_else: "else"
"""
self.check_scopes(
code,
{"in_elif": "elif"},
{"in_else": "else"}
)
def test_try(self):
code = """
try:
if {cond}:
raise Exception
in_try: "try"
except Exception:
in_except: "except"
finally:
in_finally: "finally"
"""
self.check_scopes(
code,
{"in_except": "except", "in_finally": "finally"},
{"in_try": "try", "in_finally": "finally"}
)
def test_try_star(self):
code = """
try:
if {cond}:
raise Exception
in_try_star: "try"
except* Exception:
in_except_star: "except"
finally:
in_finally: "finally"
"""
self.check_scopes(
code,
{"in_except_star": "except", "in_finally": "finally"},
{"in_try_star": "try", "in_finally": "finally"}
)
def test_while(self):
code = """
while {cond}:
in_while: "while"
break
else:
in_else: "else"
"""
self.check_scopes(
code,
{"in_while": "while"},
{"in_else": "else"}
)
def test_for(self):
code = """
for _ in ([1] if {cond} else []):
in_for: "for"
else:
in_else: "else"
"""
self.check_scopes(
code,
{"in_for": "for", "in_else": "else"},
{"in_else": "else"}
)
def test_match(self):
code = """
match {cond}:
case True:
x: "true"
case False:
x: "false"
"""
self.check_scopes(
code,
{"x": "true"},
{"x": "false"}
)
def test_nesting_override(self):
code = """
if {cond}:
x: "foo"
if {cond}:
x: "bar"
"""
self.check_scopes(
code,
{"x": "bar"},
{}
)
def test_nesting_outer(self):
code = """
if {cond}:
outer_before: "outer_before"
if len:
inner_if: "inner_if"
else:
inner_else: "inner_else"
outer_after: "outer_after"
"""
self.check_scopes(
code,
{"outer_before": "outer_before", "inner_if": "inner_if",
"outer_after": "outer_after"},
{}
)
def test_nesting_inner(self):
code = """
if len:
outer_before: "outer_before"
if {cond}:
inner_if: "inner_if"
else:
inner_else: "inner_else"
outer_after: "outer_after"
"""
self.check_scopes(
code,
{"outer_before": "outer_before", "inner_if": "inner_if",
"outer_after": "outer_after"},
{"outer_before": "outer_before", "inner_else": "inner_else",
"outer_after": "outer_after"},
)
def test_non_name_annotations(self):
code = """
before: "before"
if {cond}:
a = "x"
a[0]: int
else:
a = object()
a.b: str
after: "after"
"""
expected = {"before": "before", "after": "after"}
self.check_scopes(code, expected, expected)
class RegressionTests(unittest.TestCase):
# gh-132479
def test_complex_comprehension_inlining(self):
# Test that the various repro cases from the issue don't crash
cases = [
"""
(unique_name_0): 0
unique_name_1: (
0
for (
0
for unique_name_2 in 0
for () in (0 for unique_name_3 in unique_name_4 for unique_name_5 in name_1)
).name_3 in {0: 0 for name_1 in unique_name_8}
if name_1
)
""",
"""
unique_name_0: 0
unique_name_1: {
0: 0
for unique_name_2 in [0 for name_0 in unique_name_4]
if {
0: 0
for unique_name_5 in 0
if name_0
if ((name_0 for unique_name_8 in unique_name_9) for [] in 0)
}
}
""",
"""
0[0]: {0 for name_0 in unique_name_1}
unique_name_2: {
0: (lambda: name_0 for unique_name_4 in unique_name_5)
for unique_name_6 in ()
if name_0
}
""",
]
for case in cases:
case = textwrap.dedent(case)
compile(case, "<test>", "exec")
def test_complex_comprehension_inlining_exec(self):
code = """
unique_name_1 = unique_name_5 = [1]
name_0 = 42
unique_name_7: {name_0 for name_0 in unique_name_1}
unique_name_2: {
0: (lambda: name_0 for unique_name_4 in unique_name_5)
for unique_name_6 in [1]
if name_0
}
"""
mod = build_module(code)
annos = mod.__annotations__
self.assertEqual(annos.keys(), {"unique_name_7", "unique_name_2"})
self.assertEqual(annos["unique_name_7"], {True})
genexp = annos["unique_name_2"][0]
lamb = list(genexp)[0]
self.assertEqual(lamb(), 42)
def test_annotate_qualname(self):
code = """
def f() -> None:
def nested() -> None: pass
return nested
class Outer:
x: int
def method(self, x: int):
pass
"""
ns = run_code(code)
method = ns["Outer"].method
self.assertEqual(method.__annotate__.__qualname__, "Outer.method.__annotate__")
self.assertEqual(ns["f"].__annotate__.__qualname__, "f.__annotate__")
self.assertEqual(ns["f"]().__annotate__.__qualname__, "f.<locals>.nested.__annotate__")
self.assertEqual(ns["Outer"].__annotate__.__qualname__, "Outer.__annotate__")
# gh-138349
def test_module_level_annotation_plus_listcomp(self):
cases = [
"""
def report_error():
pass
try:
[0 for name_2 in unique_name_0 if (lambda: name_2)]
except:
pass
annotated_name: 0
""",
"""
class Generic:
pass
try:
[0 for name_2 in unique_name_0 if (0 for unique_name_1 in unique_name_2 for unique_name_3 in name_2)]
except:
pass
annotated_name: 0
""",
"""
class Generic:
pass
annotated_name: 0
try:
[0 for name_2 in [[0]] for unique_name_1 in unique_name_2 if (lambda: name_2)]
except:
pass
""",
]
for code in cases:
with self.subTest(code=code):
mod = build_module(code)
annos = mod.__annotations__
self.assertEqual(annos, {"annotated_name": 0})
# gh-154902
def test_conditional_annotations_rebound(self):
# user code can rebind __conditional_annotations__ to any object
lefts = ("__conditional_annotations__",
'globals()["__conditional_annotations__"]')
values = ("0", "{}", "[]", "''", "object()", "frozenset()")
for left, value in itertools.product(lefts, values):
with self.subTest(left=left, value=value):
code = f"""
{left} = {value}
x: int
"""
with self.assertRaises(TypeError):
run_code(code)