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gh-132805 - annotationlib - Fix unions of real types and forward references. by DavidCEllis · Pull Request #132806 · python/cpython · GitHub

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gh-132805 - annotationlib - Fix unions of real types and forward references. #132806

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gh-132805 - annotationlib - Fix unions of real types and forward references. #132806

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fba5efa
Add a test for union forward references
DavidCEllis Apr 22, 2025
d810953
Make stringifiers create unions if create_unions is True
DavidCEllis Apr 22, 2025
1908a4a
modify broken test, move test to forwardref format group
DavidCEllis Apr 22, 2025
97abdc7
Apparently trim trailing whitespace was turned off
DavidCEllis Apr 22, 2025
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29 changes: 25 additions & 4 deletions Lib/annotationlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -392,12 +392,19 @@ def binop(self, other):
__mod__ = _make_binop(ast.Mod())
__lshift__ = _make_binop(ast.LShift())
__rshift__ = _make_binop(ast.RShift())
__or__ = _make_binop(ast.BitOr())
__xor__ = _make_binop(ast.BitXor())
__and__ = _make_binop(ast.BitAnd())
__floordiv__ = _make_binop(ast.FloorDiv())
__pow__ = _make_binop(ast.Pow())

def __or__(self, other):
if self.__stringifier_dict__.create_unions:
return types.UnionType[self, other]

return self.__make_new(
ast.BinOp(self.__get_ast(), ast.BitOr(), self.__convert_to_ast(other))
)

del _make_binop

def _make_rbinop(op: ast.AST):
Expand All @@ -416,12 +423,19 @@ def rbinop(self, other):
__rmod__ = _make_rbinop(ast.Mod())
__rlshift__ = _make_rbinop(ast.LShift())
__rrshift__ = _make_rbinop(ast.RShift())
__ror__ = _make_rbinop(ast.BitOr())
__rxor__ = _make_rbinop(ast.BitXor())
__rand__ = _make_rbinop(ast.BitAnd())
__rfloordiv__ = _make_rbinop(ast.FloorDiv())
__rpow__ = _make_rbinop(ast.Pow())

def __ror__(self, other):
if self.__stringifier_dict__.create_unions:
return types.UnionType[other, self]

return self.__make_new(
ast.BinOp(self.__convert_to_ast(other), ast.BitOr(), self.__get_ast())
)

del _make_rbinop

def _make_compare(op):
Expand Down Expand Up @@ -459,12 +473,13 @@ def unary_op(self):


class _StringifierDict(dict):
def __init__(self, namespace, globals=None, owner=None, is_class=False):
def __init__(self, namespace, globals=None, owner=None, is_class=False, create_unions=False):
super().__init__(namespace)
self.namespace = namespace
self.globals = globals
self.owner = owner
self.is_class = is_class
self.create_unions = create_unions
self.stringifiers = []

def __missing__(self, key):
Expand Down Expand Up @@ -569,7 +584,13 @@ def call_annotate_function(annotate, format, *, owner=None, _is_evaluate=False):
# that returns a bool and an defined set of attributes.
namespace = {**annotate.__builtins__, **annotate.__globals__}
is_class = isinstance(owner, type)
globals = _StringifierDict(namespace, annotate.__globals__, owner, is_class)
globals = _StringifierDict(
namespace,
annotate.__globals__,
owner,
is_class,
create_unions=True
)
if annotate.__closure__:
freevars = annotate.__code__.co_freevars
new_closure = []
Expand Down
28 changes: 26 additions & 2 deletions Lib/test/test_annotationlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -115,8 +115,11 @@ def f(
self.assertEqual(z_anno, support.EqualToForwardRef("some(module)", owner=f))

alpha_anno = anno["alpha"]
self.assertIsInstance(alpha_anno, ForwardRef)
self.assertEqual(alpha_anno, support.EqualToForwardRef("some | obj", owner=f))
self.assertIsInstance(alpha_anno, Union)
self.assertEqual(
typing.get_args(alpha_anno),
(support.EqualToForwardRef("some", owner=f), support.EqualToForwardRef("obj", owner=f))
)

beta_anno = anno["beta"]
self.assertIsInstance(beta_anno, ForwardRef)
Expand All @@ -126,6 +129,27 @@ def f(
self.assertIsInstance(gamma_anno, ForwardRef)
self.assertEqual(gamma_anno, support.EqualToForwardRef("some < obj", owner=f))

def test_partially_nonexistent_union(self):
# Test unions with '|' syntax equal unions with typing.Union[] with some forwardrefs
class UnionForwardrefs:
pipe: str | undefined
union: Union[str, undefined]

annos = get_annotations(UnionForwardrefs, format=Format.FORWARDREF)

match = (
str,
support.EqualToForwardRef("undefined", is_class=True, owner=UnionForwardrefs)
)

self.assertEqual(
typing.get_args(annos["pipe"]),
typing.get_args(annos["union"])
)

self.assertEqual(typing.get_args(annos["pipe"]), match)
self.assertEqual(typing.get_args(annos["union"]), match)


class TestSourceFormat(unittest.TestCase):
def test_closure(self):
Expand Down
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