diff --git a/moto/backends.py b/moto/backends.py
index 7df167a0..1a333415 100644
--- a/moto/backends.py
+++ b/moto/backends.py
@@ -60,6 +60,7 @@ BACKENDS = {
     'datapipeline': datapipeline_backends,
     'dynamodb': dynamodb_backends,
     'dynamodb2': dynamodb_backends2,
+    'dynamodbstreams': dynamodbstreams_backends,
     'ec2': ec2_backends,
     'ecr': ecr_backends,
     'ecs': ecs_backends,
diff --git a/moto/dynamodb2/models.py b/moto/dynamodb2/models.py
index 4283c038..e2882f1e 100644
--- a/moto/dynamodb2/models.py
+++ b/moto/dynamodb2/models.py
@@ -1,5 +1,5 @@
 from __future__ import unicode_literals
-from collections import defaultdict, namedtuple
+from collections import defaultdict
 import copy
 import datetime
 import decimal
@@ -302,7 +302,7 @@ class StreamRecord(BaseModel):
         keys = {table.hash_key_attr: rec.hash_key.to_json()}
         if table.range_key_attr is not None:
             keys[table.range_key_attr] = rec.range_key.to_json()
-                
+
         self.record = {
             'eventID': uuid.uuid4().hex,
             'eventName': event_name,
@@ -317,7 +317,7 @@ class StreamRecord(BaseModel):
                 'Keys': keys
             }
         }
-                    
+
         if stream_type in ('NEW_IMAGE', 'NEW_AND_OLD_IMAGES'):
             self.record['dynamodb']['NewImage'] = new_a
         if stream_type in ('OLD_IMAGE', 'NEW_AND_OLD_IMAGES'):
@@ -364,7 +364,7 @@ class StreamShard(BaseModel):
         assert start >= 0
         end = start + quantity
         return [i.to_json() for i in self.items[start:end]]
-            
+
 
 class Table(BaseModel):
 
@@ -485,7 +485,7 @@ class Table(BaseModel):
             else:
                 lookup_range_value = DynamoType(expected_range_value)
         current = self.get_item(hash_value, lookup_range_value)
-        
+
         item = Item(hash_value, self.hash_key_type, range_value,
                     self.range_key_type, item_attrs)
 
@@ -520,10 +520,10 @@ class Table(BaseModel):
             self.items[hash_value][range_value] = item
         else:
             self.items[hash_value] = item
-            
+
         if self.stream_shard is not None:
             self.stream_shard.add(current, item)
-        
+
         return item
 
     def __nonzero__(self):
@@ -560,7 +560,7 @@ class Table(BaseModel):
 
             if self.stream_shard is not None:
                 self.stream_shard.add(item, None)
-            
+
             return item
         except KeyError:
             return None
diff --git a/moto/dynamodb2/responses.py b/moto/dynamodb2/responses.py
index 73bd3ae3..d2bf99bf 100644
--- a/moto/dynamodb2/responses.py
+++ b/moto/dynamodb2/responses.py
@@ -175,7 +175,7 @@ class DynamoHandler(BaseResponse):
             table = self.dynamodb_backend.update_table_throughput(name, throughput)
         if 'StreamSpecification' in self.body:
             table = self.dynamodb_backend.update_table_streams(name, self.body['StreamSpecification'])
-        
+
         return dynamo_json_dump(table.describe())
 
     def describe_table(self):
diff --git a/moto/dynamodbstreams/models.py b/moto/dynamodbstreams/models.py
index 7b43eb74..41cc6e28 100644
--- a/moto/dynamodbstreams/models.py
+++ b/moto/dynamodbstreams/models.py
@@ -4,7 +4,6 @@ import os
 import json
 import boto3
 import base64
-import datetime
 
 from moto.core import BaseBackend, BaseModel
 from moto.dynamodb2.models import dynamodb_backends
@@ -31,7 +30,7 @@ class ShardIterator(BaseModel):
             self.stream_shard.table.table_arn,
             self.stream_shard.table.latest_stream_label,
             self.id)
-    
+
     def to_json(self):
         return {
             'ShardIterator': self.arn
@@ -67,7 +66,7 @@ class DynamoDBStreamsBackend(BaseBackend):
         region = self.region
         self.__dict__ = {}
         self.__init__(region)
-        
+
     @property
     def dynamodb(self):
         return dynamodb_backends[self.region]
@@ -75,7 +74,7 @@ class DynamoDBStreamsBackend(BaseBackend):
     def _get_table_from_arn(self, arn):
         table_name = arn.split(':', 6)[5].split('/')[1]
         return self.dynamodb.get_table(table_name)
-    
+
     def describe_stream(self, arn):
         table = self._get_table_from_arn(arn)
         resp = {'StreamDescription': {
@@ -90,7 +89,7 @@ class DynamoDBStreamsBackend(BaseBackend):
             'Shards': ([table.stream_shard.to_json()] if table.stream_shard
                        else [])
         }}
-        
+
         return json.dumps(resp)
 
     def list_streams(self, table_name=None):
@@ -105,7 +104,7 @@ class DynamoDBStreamsBackend(BaseBackend):
                     'TableName': d['Table']['TableName'],
                     'StreamLabel': d['Table']['LatestStreamLabel']
                 })
-                
+
         return json.dumps({'Streams': streams})
 
     def get_shard_iterator(self, arn, shard_id, shard_iterator_type, sequence_number=None):
@@ -116,14 +115,13 @@ class DynamoDBStreamsBackend(BaseBackend):
                                        shard_iterator_type,
                                        sequence_number)
         self.shard_iterators[shard_iterator.arn] = shard_iterator
-        
+
         return json.dumps(shard_iterator.to_json())
 
     def get_records(self, iterator_arn, limit):
         shard_iterator = self.shard_iterators[iterator_arn]
         return json.dumps(shard_iterator.get(limit))
 
-    
 
 available_regions = boto3.session.Session().get_available_regions(
     'dynamodbstreams')
diff --git a/moto/dynamodbstreams/responses.py b/moto/dynamodbstreams/responses.py
index c07377d3..c9c11361 100644
--- a/moto/dynamodbstreams/responses.py
+++ b/moto/dynamodbstreams/responses.py
@@ -1,7 +1,5 @@
 from __future__ import unicode_literals
 
-import json
-
 from moto.core.responses import BaseResponse
 
 from .models import dynamodbstreams_backends
@@ -12,7 +10,7 @@ class DynamoDBStreamsHandler(BaseResponse):
     @property
     def backend(self):
         return dynamodbstreams_backends[self.region]
-    
+
     def describe_stream(self):
         arn = self._get_param('StreamArn')
         return self.backend.describe_stream(arn)