gh-151128: Improve SyntaxError message for cross language keywords

Grammar/python.gram

@@ -1287,6 +1287,12 @@ invalid_named_expression(memo):
     | a=expression ':=' expression {
         RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
             a, "cannot use assignment expressions with %s", _PyPegen_get_expr_name(a)) }
+    | a=expression '&''&' b=expression {
+        RAISE_SYNTAX_ERROR_KNOWN_RANGE(
+            a, b, "invalid syntax '&&'. Use 'and' instead.") }
+    | a=expression '|''|' b=expression {
+        RAISE_SYNTAX_ERROR_KNOWN_RANGE(
+            a, b, "invalid syntax '||'. Use 'or' instead.") }
     | a=NAME '=' b=bitwise_or !('='|':=') {
         RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Maybe you meant '==' or ':=' instead of '='?") }
     | !(list|tuple|genexp|'True'|'None'|'False') a=bitwise_or b='=' bitwise_or !('='|':=') {

Lib/traceback.py

@@ -1485,8 +1485,12 @@ def _find_keyword_typos(self):
             # Limit the number of possible matches to try
             max_matches = 3
             matches = []
+
+            hint = _get_cross_language_keyword_hint(wrong_name)
+            if hint:
+                matches.append(hint)
             if _suggestions is not None:
-                suggestion = _suggestions._generate_suggestions(keyword.kwlist, wrong_name)
+                suggestion = _suggestions._generate_suggestions(keyword.kwlist + keyword.softkwlist, wrong_name)
                 if suggestion:
                     matches.append(suggestion)
             matches.extend(difflib.get_close_matches(wrong_name, keyword.kwlist, n=max_matches, cutoff=0.5))
@@ -1787,6 +1791,20 @@ def print(self, *, file=None, chain=True, **kwargs):
 })
 
 
+# Cross-language keyword suggestions.
+_CROSS_LANGUAGE_KEYWORD_HINTS = frozendict({
+    # C/C++ equivalents
+    'switch': 'match',
+    'delete': 'del',
+    # function define equivalents
+    'function': 'def',
+    'func': 'def',
+    # null equivalents
+    'NULL': 'None',
+    'null': 'None',
+    'nil': 'None',
+})
+
 def _substitution_cost(ch_a, ch_b):
     if ch_a == ch_b:
         return 0
@@ -1866,6 +1884,13 @@ def _get_cross_language_hint(obj, wrong_name):
     return None
 
 
+def _get_cross_language_keyword_hint(wrong_name):
+    """Check if wrong_name is a common keyword from another language
+    """
+    hint = _CROSS_LANGUAGE_KEYWORD_HINTS.get(wrong_name)
+    return hint
+
+
 def _get_safe___dir__(obj):
     # Use obj.__dir__() to avoid a TypeError when calling dir(obj).
     # See gh-131001 and gh-139933.