Ticket #11859: validation.diff

django/core/management/validation.py

@@ -58 +58 @@
                     e.add(opts, '"%s": "choices" should be iterable (e.g., a tuple or list).' % f.name)
                 else:
                     for c in f.choices:
-                        if not type(c) in (tuple, list) or len(c) != 2:
+                        if not (isinstance(c, tuple) or isinstance(c, list)) or len(c) != 2:
                             e.add(opts, '"%s": "choices" should be a sequence of two-tuples.' % f.name)
             if f.db_index not in (None, True, False):
                 e.add(opts, '"%s": "db_index" should be either None, True or False.' % f.name)