gh-150459: Fix SyntaxError message for from x lazy import y

Author: sobolevn

Grammar/python.gram

@@ -229,6 +229,7 @@ import_name[stmt_ty]:
 
 # note below: the ('.' | '...') is necessary because '...' is tokenized as ELLIPSIS
 import_from[stmt_ty]:
+    | invalid_import_from
     | lazy="lazy"? 'from' a=('.' | '...')* b=dotted_name 'import' c=import_from_targets {
         _PyPegen_checked_future_import(p, b->v.Name.id, c, _PyPegen_seq_count_dots(a), lazy, EXTRA) }
     | lazy="lazy"? 'from' a=('.' | '...')+ 'import' b=import_from_targets {
@@ -1443,6 +1444,11 @@ invalid_import_from_as_name:
         RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a,
             "cannot use %s as import target", _PyPegen_get_expr_name(a)) }
 
+invalid_import_from:
+    | 'from' ('.' | '...')* dotted_name a="lazy" 'import' import_from_targets {
+        RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a,
+            "use 'lazy from ... ' instead of 'from ... lazy import'") }
+
 invalid_import_from_targets:
     | import_from_as_names ',' NEWLINE {
         RAISE_SYNTAX_ERROR("trailing comma not allowed without surrounding parentheses") }

Lib/test/test_syntax.py

@@ -3618,6 +3618,10 @@ def inner():
         lazy from collections import deque
 """, "lazy from ... import not allowed inside functions")
 
+        self._check_error("""\
+from os lazy import path
+""", "use 'lazy from ... ' instead of 'from ... lazy import'")
+
     def test_lazy_import_valid_cases(self):
         """Test that lazy imports work at module level."""
         # These should compile without errors

Misc/NEWS.d/next/Core_and_Builtins/2026-06-03-21-14-28.gh-issue-150459.qpsCEl.rst

@@ -0,0 +1 @@
+Fix :exc:`SyntaxError` error message for ``from x lazy import y``.