Issue #25108: Omitted internal frames in traceback functions print_stack(),

format_stack(), and extract_stack() called without arguments.

Lib/test/test_traceback.py

@@ -289,6 +289,31 @@ class TracebackFormatTests(unittest.TestCase):
 
         self.assertEqual(ststderr.getvalue(), "".join(stfmt))
 
+    def test_print_stack(self):
+        def prn():
+            traceback.print_stack()
+        with captured_output("stderr") as stderr:
+            prn()
+        lineno = prn.__code__.co_firstlineno
+        self.assertEqual(stderr.getvalue().splitlines()[-4:], [
+            '  File "%s", line %d, in test_print_stack' % (__file__, lineno+3),
+            '    prn()',
+            '  File "%s", line %d, in prn' % (__file__, lineno+1),
+            '    traceback.print_stack()',
+        ])
+
+    def test_format_stack(self):
+        def fmt():
+            return traceback.format_stack()
+        result = fmt()
+        lineno = fmt.__code__.co_firstlineno
+        self.assertEqual(result[-2:], [
+            '  File "%s", line %d, in test_format_stack\n'
+            '    result = fmt()\n' % (__file__, lineno+2),
+            '  File "%s", line %d, in fmt\n'
+            '    return traceback.format_stack()\n' % (__file__, lineno+1),
+        ])
+
 
 cause_message = (
     "\nThe above exception was the direct cause "
@@ -610,6 +635,16 @@ class MiscTracebackCases(unittest.TestCase):
         # Local variable dict should now be empty.
         self.assertEqual(len(inner_frame.f_locals), 0)
 
+    def test_extract_stack(self):
+        def extract():
+            return traceback.extract_stack()
+        result = extract()
+        lineno = extract.__code__.co_firstlineno
+        self.assertEqual([tuple(x) for x in result[-2:]], [
+            (__file__, lineno+2, 'test_extract_stack', 'result = extract()'),
+            (__file__, lineno+1, 'extract', 'return traceback.extract_stack()'),
+            ])
+
 
 class TestFrame(unittest.TestCase):
 

Lib/traceback.py

@@ -181,11 +181,15 @@ def print_stack(f=None, limit=None, file=None):
     stack frame at which to start. The optional 'limit' and 'file'
     arguments have the same meaning as for print_exception().
     """
+    if f is None:
+        f = sys._getframe().f_back
     print_list(extract_stack(f, limit=limit), file=file)
 
 
 def format_stack(f=None, limit=None):
     """Shorthand for 'format_list(extract_stack(f, limit))'."""
+    if f is None:
+        f = sys._getframe().f_back
     return format_list(extract_stack(f, limit=limit))
 
 
@@ -198,6 +202,8 @@ def extract_stack(f=None, limit=None):
     line number, function name, text), and the entries are in order
     from oldest to newest stack frame.
     """
+    if f is None:
+        f = sys._getframe().f_back
     stack = StackSummary.extract(walk_stack(f), limit=limit)
     stack.reverse()
     return stack

Misc/NEWS

@@ -103,6 +103,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #25108: Omitted internal frames in traceback functions print_stack(),
+  format_stack(), and extract_stack() called without arguments.
+
 - Issue #25118: Fix a regression of Python 3.5.0 in os.waitpid() on Windows.
 
 - Issue #24684: socket.socket.getaddrinfo() now calls