我想创建一个表单，允许使用 flask 表单发送带有描述的图片。我试着使用这个视频：https://www.youtube.com/watch?v=Exf8RbgKmhM
但我在启动www.example.com时遇到了问题app.py:

➜  website git:(master) ✗ python3.6 app.py
Traceback (most recent call last):
  File "app.py", line 10, in <module>
    from flask.ext.uploads import UploadSet, configure_uploads, IMAGES
ModuleNotFoundError: No module named 'flask.ext'

我不得不用flask_uploads替换flask.ext.uploads，但现在我得到：

Traceback (most recent call last):
  File "app.py", line 10, in <module>
    from flask_uploads import UploadSet, configure_uploads, IMAGES
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/flask_uploads.py", line 26, in <module>
    from werkzeug import secure_filename, FileStorage
ImportError: cannot import name 'secure_filename'

我的导入和配置如下所示：

from datetime import datetime
from flask_sqlalchemy import SQLAlchemy
from flask import Flask, session, render_template, url_for, redirect, flash, request
from wtforms import Form, fields,TextField, StringField, PasswordField, BooleanField,validators
from wtforms.validators import InputRequired, Email, Length, DataRequired
from flask_wtf import FlaskForm
from flask_uploads import UploadSet, configure_uploads, IMAGES
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user

我解决不了这个问题，你知道我该怎么办吗？