Fix unicode default input on py3

django/db/migrations/questioner.py

@@ -3,7 +3,7 @@
 import sys
 
 from django.apps import apps
-from django.utils import datetime_safe
+from django.utils import datetime_safe, six
 from django.utils.six.moves import input
 
 from .loader import MIGRATIONS_MODULE_NAME
@@ -97,7 +97,13 @@ def ask_not_null_addition(self, field_name, model_name):
             print("Please enter the default value now, as valid Python")
             print("The datetime module is available, so you can do e.g. datetime.date.today()")
             while True:
-                code = input(">>> ").decode(sys.stdin.encoding)
+                if six.PY3:
+                    # Six does not correctly abstract over the fact that
+                    # py3 input returns a unicode string, while py2 raw_input
+                    # returns a bytestring.
+                    code = input(">>> ")
+                else:
+                    code = input(">>> ").decode(sys.stdin.encoding)
                 if not code:
                     print("Please enter some code, or 'exit' (with no quotes) to exit.")
                 elif code == "exit":