From f4104f5d74b99712253fceb39a4460ee3f7a281c Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 10 Oct 2025 10:51:24 +0300
Subject: [PATCH] gh-139783: Fix inspect.getsourcelines() for the case when a
 decorator is followed by a comment or an empty line (GH-139836)

---
 Lib/inspect.py                                       |  4 +++-
 Lib/test/test_inspect/inspect_fodder2.py             | 12 ++++++++++++
 Lib/test/test_inspect/test_inspect.py                |  4 ++++
 .../2025-10-09-13-48-28.gh-issue-139783.__NUgo.rst   |  2 ++
 4 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2025-10-09-13-48-28.gh-issue-139783.__NUgo.rst

diff --git a/Lib/inspect.py b/Lib/inspect.py
index b345623b3fa..bb22bab3040 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1065,7 +1065,9 @@ def __init__(self):
 
     def tokeneater(self, type, token, srowcol, erowcol, line):
         if not self.started and not self.indecorator:
-            if type == tokenize.INDENT or token == "async":
+            if type in (tokenize.INDENT, tokenize.COMMENT, tokenize.NL):
+                pass
+            elif token == "async":
                 pass
             # skip any decorators
             elif token == "@":
diff --git a/Lib/test/test_inspect/inspect_fodder2.py b/Lib/test/test_inspect/inspect_fodder2.py
index 1de283f672d..157e12167b5 100644
--- a/Lib/test/test_inspect/inspect_fodder2.py
+++ b/Lib/test/test_inspect/inspect_fodder2.py
@@ -388,4 +388,16 @@ def func383():
     )
     return ge385
 
+# line 391
+@decorator
+# comment
+def func394():
+    return 395
+
+# line 397
+@decorator
+
+def func400():
+    return 401
+
 pass # end of file
diff --git a/Lib/test/test_inspect/test_inspect.py b/Lib/test/test_inspect/test_inspect.py
index e32e34c63b5..d42f2dbff99 100644
--- a/Lib/test/test_inspect/test_inspect.py
+++ b/Lib/test/test_inspect/test_inspect.py
@@ -1223,6 +1223,10 @@ def test_generator_expression(self):
         self.assertSourceEqual(next(mod2.ge377), 377, 380)
         self.assertSourceEqual(next(mod2.func383()), 385, 388)
 
+    def test_comment_or_empty_line_after_decorator(self):
+        self.assertSourceEqual(mod2.func394, 392, 395)
+        self.assertSourceEqual(mod2.func400, 398, 401)
+
 
 class TestNoEOL(GetSourceBase):
     def setUp(self):
diff --git a/Misc/NEWS.d/next/Library/2025-10-09-13-48-28.gh-issue-139783.__NUgo.rst b/Misc/NEWS.d/next/Library/2025-10-09-13-48-28.gh-issue-139783.__NUgo.rst
new file mode 100644
index 00000000000..336653e73bf
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-10-09-13-48-28.gh-issue-139783.__NUgo.rst
@@ -0,0 +1,2 @@
+Fix :func:`inspect.getsourcelines` for the case when a decorator is followed
+by a comment or an empty line.