gh-106922: Fix error location for constructs with spaces and parentheses (#108959)

2 files changed, 49 insertions, 3 deletions

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index 316ade2..be81082 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -596,6 +596,24 @@ class TracebackErrorLocationCaretTestBase:
         result_lines = self.get_exception(f_with_binary_operator)
         self.assertEqual(result_lines, expected_error.splitlines())
 
+    def test_caret_for_binary_operators_with_spaces_and_parenthesis(self):
+        def f_with_binary_operator():
+            a = 1
+            b = ""
+            return ( a   )   + b
+
+        lineno_f = f_with_binary_operator.__code__.co_firstlineno
+        expected_error = (
+            'Traceback (most recent call last):\n'
+            f'  File "{__file__}", line {self.callable_line}, in get_exception\n'
+            '    callable()\n'
+            f'  File "{__file__}", line {lineno_f+3}, in f_with_binary_operator\n'
+            '    return ( a   )   + b\n'
+            '           ~~~~~~~~~~^~~\n'
+        )
+        result_lines = self.get_exception(f_with_binary_operator)
+        self.assertEqual(result_lines, expected_error.splitlines())
+
     def test_caret_for_subscript(self):
         def f_with_subscript():
             some_dict = {'x': {'y': None}}
@@ -630,6 +648,24 @@ class TracebackErrorLocationCaretTestBase:
         result_lines = self.get_exception(f_with_subscript)
         self.assertEqual(result_lines, expected_error.splitlines())
 
+    def test_caret_for_subscript_with_spaces_and_parenthesis(self):
+        def f_with_binary_operator():
+            a = []
+            b = c = 1
+            return b     [    a  ] + c
+
+        lineno_f = f_with_binary_operator.__code__.co_firstlineno
+        expected_error = (
+            'Traceback (most recent call last):\n'
+            f'  File "{__file__}", line {self.callable_line}, in get_exception\n'
+            '    callable()\n'
+            f'  File "{__file__}", line {lineno_f+3}, in f_with_binary_operator\n'
+            '    return b     [    a  ] + c\n'
+            '           ~~~~~~^^^^^^^^^\n'
+        )
+        result_lines = self.get_exception(f_with_binary_operator)
+        self.assertEqual(result_lines, expected_error.splitlines())
+
     def test_traceback_specialization_with_syntax_error(self):
         bytecode = compile("1 / 0 / 1 / 2\n", TESTFN, "exec")
 
diff --git a/Lib/traceback.py b/Lib/traceback.py
index 354754b..67941ff 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -608,11 +608,21 @@ def _extract_caret_anchors_from_line_segment(segment):
                         and not operator_str[operator_offset + 1].isspace()
                     ):
                         right_anchor += 1
+
+                    while left_anchor < len(segment) and ((ch := segment[left_anchor]).isspace() or ch in ")#"):
+                        left_anchor += 1
+                        right_anchor += 1
                     return _Anchors(normalize(left_anchor), normalize(right_anchor))
                 case ast.Subscript():
-                    subscript_start = normalize(expr.value.end_col_offset)
-                    subscript_end = normalize(expr.slice.end_col_offset + 1)
-                    return _Anchors(subscript_start, subscript_end)
+                    left_anchor = normalize(expr.value.end_col_offset)
+                    right_anchor = normalize(expr.slice.end_col_offset + 1)
+                    while left_anchor < len(segment) and ((ch := segment[left_anchor]).isspace() or ch != "["):
+                        left_anchor += 1
+                    while right_anchor < len(segment) and ((ch := segment[right_anchor]).isspace() or ch != "]"):
+                        right_anchor += 1
+                    if right_anchor < len(segment):
+                        right_anchor += 1
+                    return _Anchors(left_anchor, right_anchor)
 
     return None