[3.11] gh-107155: Fix help() for lambda function with return annotation (GH-115613)

(cherry picked from commit b9a9e3dd62326b726ad2e8e8efd87ca6327b4019)

1 files changed, 4 insertions, 2 deletions

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index c983cbb..56a47dc 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1128,7 +1128,8 @@ class HTMLDoc(Doc):
                     # XXX lambda's won't usually have func_annotations['return']
                     # since the syntax doesn't support but it is possible.
                     # So removing parentheses isn't truly safe.
-                    argspec = argspec[1:-1] # remove parentheses
+                    if not object.__annotations__:
+                        argspec = argspec[1:-1] # remove parentheses
         if not argspec:
             argspec = '(...)'
 
@@ -1581,7 +1582,8 @@ location listed above.
                     # XXX lambda's won't usually have func_annotations['return']
                     # since the syntax doesn't support but it is possible.
                     # So removing parentheses isn't truly safe.
-                    argspec = argspec[1:-1] # remove parentheses
+                    if not object.__annotations__:
+                        argspec = argspec[1:-1] # remove parentheses
         if not argspec:
             argspec = '(...)'
         decl = asyncqualifier + title + argspec + note