bpo-42008: Fix internal _random.Random() seeding for the one argument case (GH-22668)

1 files changed, 12 insertions, 1 deletions

diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index ad4fd47..99be69c 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -519,6 +519,7 @@ random_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
     RandomObject *self;
     PyObject *tmp;
+    PyObject *arg = NULL;
     _randomstate *state = _randomstate_type(type);
 
     if (type == (PyTypeObject*)state->Random_Type &&
@@ -529,12 +530,22 @@ random_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
     self = (RandomObject *)PyType_GenericAlloc(type, 0);
     if (self == NULL)
         return NULL;
-    tmp = random_seed(self, args);
+
+    if (PyTuple_GET_SIZE(args) > 1) {
+        PyErr_SetString(PyExc_TypeError, "Random() requires 0 or 1 argument");
+        return NULL;
+    }
+
+    if (PyTuple_GET_SIZE(args) == 1)
+        arg = PyTuple_GET_ITEM(args, 0);
+    
+    tmp = random_seed(self, arg);
     if (tmp == NULL) {
         Py_DECREF(self);
         return NULL;
     }
     Py_DECREF(tmp);
+
     return (PyObject *)self;
 }