Fmt/lint

Author: andresliszt

Misc/NEWS.d/next/Core_and_Builtins/2026-02-21-16-13-57.gh-issue-145076.N3fQ-Q.rst

@@ -0,0 +1,3 @@
+Fixed a :exc:`SystemError` in :func:`__lazy_import__` caused by passing
+invalid argument types. Added proper type validation for *name*, *globals*,
+*locals*, and *fromlist* arguments.

Misc/mypy/_colorize.py

@@ -1 +1 @@
-../../Lib/_colorize.py
+../../Lib/_colorize.py

Misc/mypy/token.py

@@ -1 +1 @@
-../../Lib/token.py
+../../Lib/token.py

Python/bltinmodule.c

@@ -314,29 +314,29 @@ builtin___lazy_import___impl(PyObject *module, PyObject *name,
 
     // Validate input arguments
     if (!PyUnicode_Check(name)) {
-        PyErr_Format(PyExc_TypeError, 
+        PyErr_Format(PyExc_TypeError,
                      "__lazy_import__() argument 1 must be str, not %.200s",
                      Py_TYPE(name)->tp_name);
         return NULL;
     }
 
     if (globals != NULL && !PyDict_Check(globals)) {
-        PyErr_Format(PyExc_TypeError, 
+        PyErr_Format(PyExc_TypeError,
                      "__lazy_import__() argument 2 must be dict, not %.200s",
                      Py_TYPE(globals)->tp_name);
         return NULL;
     }
 
     if (locals != NULL && !PyDict_Check(locals)) {
-        PyErr_Format(PyExc_TypeError, 
+        PyErr_Format(PyExc_TypeError,
                      "__lazy_import__() argument 3 must be dict, not %.200s",
                      Py_TYPE(locals)->tp_name);
         return NULL;
     }
 
-    if (fromlist != NULL && fromlist != Py_None && 
+    if (fromlist != NULL && fromlist != Py_None &&
         !PyList_Check(fromlist) && !PyTuple_Check(fromlist)) {
-        PyErr_Format(PyExc_TypeError, 
+        PyErr_Format(PyExc_TypeError,
                      "__lazy_import__() argument 4 must be a list or tuple, not %.200s",
                      Py_TYPE(fromlist)->tp_name);
         return NULL;