怎么安装python web.py

pip install web.py==0.40.dev0

import pymysql

pymysql.install_as_MySQLdb()

import web

db = web.database(dbn='mysql', host='db_host', port=3306,

                  user='root', pw='password', db='db_name', charset='utf8')

results = db.query('select * from user where id = 1;')

for user in results:

    print(user.name)

    print(user.id_no)