问题1
py2neo.errors.ConnectionUnavailable: Connection has been closed
问题2
neo4j Failed authentication attempt for ‘meter’ from 127.0.0.1
问题3
py2neo.errors,ClientError: [Security.Unauthorized] Invalid username or password.

作者：xiao黄
博客地址：https://blog.csdn.net/Python_Matlab?type=blog

为解决上述问题，博主通过各种方式，寻求帮助，最终得到解决。

本人的环境为Python3.7
Neo4j Desktop 1.2.4
py2neo 2021.2.3

• 对于问题1，在网上找的方法，并不能解决，相关办法有：将单引号改为双引号；将graph = Graph("http://localhost:7474",user= "meter",password = "123456")改为graph = Graph("http://localhost:7474",auth=( "meter","123456"))；或者在后面添加name=“neo4j”，如：graph = Graph("http://localhost:7474",auth=( "meter","123456