python · sobolevn · Mar 5, 2024 · Mar 5, 2024
@@ -5655,6 +5655,12 @@ def foo(a: 'Node[T'):
        with self.assertRaises(SyntaxError):
            get_type_hints(foo)

+    def test_syntax_error_empty_string(self):
+        for form in [typing.List, typing.Set, typing.Type, typing.Deque]:
+            with self.subTest(form=form):
+                with self.assertRaises(SyntaxError):
+                    form['']
+
    def test_name_error(self):

        def foo(a: 'Noode[T]'):

@@ -886,7 +886,7 @@ def __init__(self, arg, is_argument=True, module=None, *, is_class=False):
        # If we do `def f(*args: *Ts)`, then we'll have `arg = '*Ts'`.
        # Unfortunately, this isn't a valid expression on its own, so we
        # do the unpacking manually.
-        if arg[0] == '*':
+        if arg.startswith('*'):
            arg_to_compile = f'({arg},)[0]'  # E.g. (*Ts,)[0] or (*tuple[int, int],)[0]
        else:
            arg_to_compile = arg

diff --git a/Misc/NEWS.d/next/Library/2024-03-05-02-09-18.gh-issue-116325.FmlBYv.rst b/Misc/NEWS.d/next/Library/2024-03-05-02-09-18.gh-issue-116325.FmlBYv.rst
@@ -0,0 +1,2 @@
+:mod:`typing`: raise :exc:`SyntaxError` instead of :exc:`AttributeError`
+on forward references as empty strings.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		:mod:`typing`: raise :exc:`SyntaxError` instead of :exc:`AttributeError`
		on forward references as empty strings.