[Python-checkins] bpo-38840: Incorrect __all__ in multiprocessing.managers (GH-18034)

[miss-islington]

https://github.com/python/cpython/commit/8ece98a7e418c3c68a4c61bc47a2d0931b59a889
commit: 8ece98a7e418c3c68a4c61bc47a2d0931b59a889
branch: 3.10
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2021-08-09T10:39:05-07:00
summary:

bpo-38840: Incorrect __all__ in multiprocessing.managers (GH-18034)


This was causing test___all__ to fail on platforms lacking a shared
memory implementation.

Co-Authored-By: Xavier de Gaye <xdegaye at gmail.com>
Co-authored-by: Łukasz Langa <lukasz at langa.pl>
(cherry picked from commit d0978761118856e8ca8ea7b162a6585b8da83df9)

Co-authored-by: Zackery Spytz <zspytz at gmail.com>

files:
A Misc/NEWS.d/next/Library/2020-01-16-23-41-16.bpo-38840.VzzYZz.rst
M Lib/multiprocessing/managers.py

diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py
index b981b0e1cb8ed8..b6b4cdd9ac15eb 100644
--- a/Lib/multiprocessing/managers.py
+++ b/Lib/multiprocessing/managers.py
@@ -8,8 +8,7 @@
 # Licensed to PSF under a Contributor Agreement.
 #
 
-__all__ = [ 'BaseManager', 'SyncManager', 'BaseProxy', 'Token',
-            'SharedMemoryManager' ]
+__all__ = [ 'BaseManager', 'SyncManager', 'BaseProxy', 'Token' ]
 
 #
 # Imports
@@ -35,9 +34,11 @@
 from . import get_context
 try:
     from . import shared_memory
-    HAS_SHMEM = True
 except ImportError:
     HAS_SHMEM = False
+else:
+    HAS_SHMEM = True
+    __all__.append('SharedMemoryManager')
 
 #
 # Register some things for pickling
diff --git a/Misc/NEWS.d/next/Library/2020-01-16-23-41-16.bpo-38840.VzzYZz.rst b/Misc/NEWS.d/next/Library/2020-01-16-23-41-16.bpo-38840.VzzYZz.rst
new file mode 100644
index 00000000000000..727f62b52a710b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-01-16-23-41-16.bpo-38840.VzzYZz.rst
@@ -0,0 +1 @@
+Fix ``test___all__`` on platforms lacking a shared memory implementation.