bpo-35133: Fix mistakes when concatenate string literals on different lines. (GH-10284)


Two kind of mistakes:

1. Missed space. After concatenating there is no space between words.

2. Missed comma. Causes unintentional concatenating in a list of strings.
(cherry picked from commit 34fd4c20198dea6ab2fe8dc6d32d744d9bde868d)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 1a6c251..b0c03c0 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -1749,7 +1749,7 @@
 
 _unsupported_magics = {
     '__getattr__', '__setattr__',
-    '__init__', '__new__', '__prepare__'
+    '__init__', '__new__', '__prepare__',
     '__instancecheck__', '__subclasscheck__',
     '__del__'
 }