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/_pydecimal.py b/Lib/_pydecimal.py
index 3596900..44ea5b4 100644
--- a/Lib/_pydecimal.py
+++ b/Lib/_pydecimal.py
@@ -2021,7 +2021,7 @@
         if not other and not self:
             return context._raise_error(InvalidOperation,
                                         'at least one of pow() 1st argument '
-                                        'and 2nd argument must be nonzero ;'
+                                        'and 2nd argument must be nonzero; '
                                         '0**0 is not defined')
 
         # compute sign of result