Fix flake8 F401

app/__init__.py

@@ -9,19 +9,12 @@ import messages
 import uuid
 from flask import (
     Flask,
-    redirect,
-    url_for,
     request,
     render_template,
-    flash,
     session,
-    send_from_directory,
 )
 from flask_cors import CORS
 from flask_bootstrap import Bootstrap
-import random
-import os
-import json
 import sys
 import re
 

tasks.py

@@ -2,7 +2,6 @@ import vars
 import sys
 import json
 import time
-import signal
 
 from celery import Celery
 from flask_socketio import SocketIO

tests.py

@@ -3,7 +3,7 @@
 import unittest
 
 import flask
-from flask import abort, url_for, g
+from flask import abort, url_for
 from flask_testing import TestCase
 
 from app import create_app