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-rw-r--r--Objects/abstract.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Objects/abstract.c b/Objects/abstract.c
index d10d9d4..917195a 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1976,7 +1976,8 @@ PyObject_IsInstance(PyObject *inst, PyObject *cls)
/* Do not mask errors. */
if (!PyErr_Occurred())
PyErr_SetString(PyExc_TypeError,
- "isinstance() arg 2 must be a class or type");
+ "isinstance() arg 2 must be a class, type,"
+ " or tuple of classes and types");
return -1;
}
Py_DECREF(cls_bases);