#!/usr/bin/env python3
#coding=utf-8
import pymysql
def go() :
conn=pymysql.connect(host='127.0.0.1', user='demo', passwd='test', db='essay_quinary') ;
cur=conn.cursor();
sql="show databases;"
cur.execute(sql);
r=cur.fetchall();
print("aaaa");
print(r);
return r