improve: introduce isort for linting Python imports (#1983)

api/controllers/console/app/statistic.py

@@ -1,19 +1,18 @@
 # -*- coding:utf-8 -*-
-from decimal import Decimal
 from datetime import datetime
+from decimal import Decimal
 
 import pytz
-from flask import jsonify
-from flask_login import current_user
-from libs.login import login_required
-from flask_restful import Resource, reqparse
-
 from controllers.console import api
 from controllers.console.app import _get_app
 from controllers.console.setup import setup_required
 from controllers.console.wraps import account_initialization_required
-from libs.helper import datetime_string
 from extensions.ext_database import db
+from flask import jsonify
+from flask_login import current_user
+from flask_restful import Resource, reqparse
+from libs.helper import datetime_string
+from libs.login import login_required
 
 
 class DailyConversationStatistic(Resource):