项目安装（pip）

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