Fix unicode default input on py3

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

            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:

                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.")