pip安裝：
- hello wolrd:
(venv) D:\MySpace\FlaskDemo>pip install flask- web表單
(venv) D:\MySpace\FlaskDemo>pip install Flask-WTF- 數(shù)據(jù)庫
(venv) D:\MySpace\FlaskDemo>pip install flask_sqlalchemy- 用戶登錄
(venv) D:\MySpace\FlaskDemo>pip install Flask-Login
(venv) D:\MySpace\FlaskDemo>pip install Flask-OpenID
導(dǎo)入模塊操作：
web表單
from flask_wtf import FlaskForm
from wtforms import StringField, BooleanField
from wtforms.validators import DataRequired數(shù)據(jù)庫
from flask_sqlalchemy import SQLAlchemy用戶登錄
from flask_openid import OpenID
from flask_login import LoginManager
