It looks like a duplicate of old issue https://github.com/localstack/localstack/issues/78
But now it's reproducible for me with the latest version of LocalStack. 
import sys
import json
import logging
import traceback
import six
from moto.s3 import models as s3_models
from moto.iam import models as iam_models
from moto.sqs import models as sqs_models
from moto.core import BaseModel
from moto.server import main as moto_main
from moto.dynamodb import models as dynamodb_models
from moto.dynamodb2 import models as dynamodb2_models