Used six.moves.zip_longest, new in six 1.4.0.

import datetime

try:

    from itertools import zip_longest

except ImportError:

    from itertools import izip_longest as zip_longest

from django.conf import settings

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

from django.db.models.sql import compiler

from django.db.models.sql.constants import MULTI

from django.utils import six

from django.utils.six.moves import zip

from django.utils.six.moves import zip, zip_longest

from django.utils import timezone

SQLCompiler = compiler.SQLCompiler

try:

    from itertools import zip_longest

except ImportError:

    from itertools import izip_longest as zip_longest

from django.db.models.sql import compiler

from django.utils.six.moves import zip_longest

class SQLCompiler(compiler.SQLCompiler):

from django.db.models.sql import compiler

# The izip_longest was renamed to zip_longest in py3

try:

    from itertools import zip_longest

except ImportError:

    from itertools import izip_longest as zip_longest

from django.utils.six.moves import zip_longest

class SQLCompiler(compiler.SQLCompiler):