old_contents: # -*- coding: utf-8 -*-
  #
  # Copyright 2017 Ricequant, Inc
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import datetime
  import json
  
  import pandas as pd
  
  from rqalpha.data.base_data_source import BaseDataSource
  from rqalpha.environment import Environment
  from rqalpha.model.snapshot import SnapshotObject
  
  from . import data_board
  
  
  class RedisDataSource(BaseDataSource):
      def __init__(self, path, redis_uri):
          super(RedisDataSource, self).__init__(path)
          self._env = Environment.get_instance()
          import redis
          self._redis_client = redis.from_url(redis_uri)
  
      def _get_snapshot_dict(self, order_book_id):
          snapshot = json.loads(self._redis_client[order_book_id].decode())
          return snapshot
  
      def get_bar(self, instrument, dt, frequency):
          snapshot_dict = self._get_snapshot_dict(instrument.order_book_id)
          return snapshot_dict
  
      def current_snapshot(self, instrument, frequency, dt):
          snapshot_dict = self._get_snapshot_dict(instrument.order_book_id)
          dt = pd.Timestamp(snapshot_dict["datetime"]).to_pydatetime()
          return SnapshotObject(instrument, snapshot_dict, dt=dt)
  
      def available_data_range(self, frequency):
          return datetime.date(2017, 1, 1), datetime.date.max
  
new_contents: # -*- coding: utf-8 -*-
  #
  # Copyright 2017 Ricequant, Inc
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import datetime
  import json
  
  import pandas as pd
  
  from rqalpha.data.base_data_source import BaseDataSource
  from rqalpha.environment import Environment
  from rqalpha.model.snapshot import SnapshotObject
  
  
  class RedisDataSource(BaseDataSource):
      def __init__(self, path, redis_uri):
          super(RedisDataSource, self).__init__(path)
          self._env = Environment.get_instance()
          import redis
          self._redis_client = redis.from_url(redis_uri)
  
      def _get_snapshot_dict(self, order_book_id):
          snapshot = json.loads(self._redis_client[order_book_id].decode())
          return snapshot
  
      def get_bar(self, instrument, dt, frequency):
          snapshot_dict = self._get_snapshot_dict(instrument.order_book_id)
          return snapshot_dict
  
      def current_snapshot(self, instrument, frequency, dt):
          snapshot_dict = self._get_snapshot_dict(instrument.order_book_id)
          dt = pd.Timestamp(snapshot_dict["datetime"]).to_pydatetime()
          return SnapshotObject(instrument, snapshot_dict, dt=dt)
  
      def available_data_range(self, frequency):
          return datetime.date(2017, 1, 1), datetime.date.max
  
subject: remove unused import