[py3] Switched to Python 3-compatible imports.

from django.test import TestCase

from django.utils.unittest import skipUnless

from django.contrib.auth.models import User, AnonymousUser

from django.core.management import call_command

from StringIO import StringIO

from django.test import TestCase

from django.utils.six import StringIO

from django.utils.unittest import skipUnless

try:

    import crypt as crypt_module

from __future__ import unicode_literals

from StringIO import StringIO

from django.contrib.auth import models, management

from django.contrib.auth.management.commands import changepassword

from django.core.management.base import CommandError

from django.test import TestCase

from django.utils.six import StringIO

class GetDefaultUsernameTestCase(TestCase):

from future_builtins import zip

from django.utils.six.moves import zip

from django.db.backends.util import truncate_name, typecast_timestamp

from django.db.models.sql import compiler

from binascii import b2a_hex

try:

    import cPickle as pickle

    from django.utils.six.moves import cPickle as pickle

except ImportError:

    import pickle

    def test_pickle(self):

        "Testing pickling and unpickling support."

        # Using both pickle and cPickle -- just 'cause.

        import pickle, cPickle

        from django.utils.six.moves import cPickle

        import pickle

        # Creating a list of test geometries for pickling,

        # and setting the SRID on some of them.