Apply batched suggestions from code review

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Author: serhiy-storchaka

Lib/gettext.py

@@ -136,9 +136,7 @@ def _parse(tokens, priority=-1):
         except ValueError:
             raise _error(nexttok) from None
         result = '%s%d' % (result, value)
-    # In C the unary '!' binds tighter than any binary operator, but Python's
-    # 'not' binds looser, so parenthesise the negated operand before the
-    # binary-operator loop below ('!n + 1' means '(!n) + 1', not '!(n + 1)').
+    # Unary '!' binds tighter than binary operators in C, unlike 'not'.
     if result.startswith('not '):
         result = '(%s)' % result
     nexttok = next(tokens)

Misc/NEWS.d/next/Library/2026-09-14-00-30-00.gh-issue-157451.k7Qm2x.rst

@@ -1,4 +1,3 @@
-Fix ``gettext.c2py`` mistranslating the unary ``!`` operator when it is
-followed by a binary operator (for example ``!n + 1``). ``!`` binds tighter
-than any binary operator in C, so the operand is now negated as a
-self-contained unit, matching the C semantics used by ``Plural-Forms`` rules.
+Fix :mod:`gettext` plural form selection when the ``Plural-Forms`` expression
+combines the unary ``!`` operator with a binary operator, for example
+``!n + 1`` or ``2 * !n``.  The latter raised :exc:`SyntaxError`.