pip安装：
- hello wolrd:
(venv) D:\MySpace\FlaskDemo>pip install flask- web表单
(venv) D:\MySpace\FlaskDemo>pip install Flask-WTF- 数据库
(venv) D:\MySpace\FlaskDemo>pip install flask_sqlalchemy- 用户登录
(venv) D:\MySpace\FlaskDemo>pip install Flask-Login
(venv) D:\MySpace\FlaskDemo>pip install Flask-OpenID
导入模块操作：
web表单
from flask_wtf import FlaskForm
from wtforms import StringField, BooleanField
from wtforms.validators import DataRequired数据库
from flask_sqlalchemy import SQLAlchemy用户登录
from flask_openid import OpenID
from flask_login import LoginManager
