ORA-12541: TNS: 无监听程序
（特别感谢）参考链接：https://blog.csdn.net/qq_43540696/article/details/102522292

Traceback (most recent call last):   File "D:\D01-software\D01010-PyCharm_community\PyCharm Community Edition 2020.1.3\plugins\python-ce\helpers\pydev\pydevd.py", line 1438, in _exec     pydev_imports.execfile(file, globals, locals)  # execute the script   File "D:\D01-software\D01010-PyCharm_community\PyCharm Community Edition 2020.1.3\plugins\python-ce\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile     exec(compile(contents+"\n", file, 'exec'), glob, loc)   File "E:/Data Mining/situational_awareness/or_eley_fee0608v1.py", line 32, in <module>     data_read1 = connect_info.select_db(sql31)   File "E:\Data Mining\situational_awareness\func0608v1.py", line 296, in select_db     conn = self.conn()   File "E:\Data Mining\situational_awareness\func0608v1.py", line 239, in conn 
conn = cx_Oracle.connect(self.name, self.password, user_info) 
cx_Oracle.DatabaseError: ORA-12541: TNS: 无监听程序

1. 检查服务是否开启

windows + R 输入Compmgmt.msc，然后回车

• OracleOraDb10g_home3TNSListener：服务监听程序（报上面弹框的原因就是因为没开启监听服务程序）
• OracleServiceORCL：数据库的主服务也叫实例，此服务的必须启动才能使用Oracle

发现服务开启了，但还是不行，那么就是Ip的原因了

2. ip的原因

重新配置oracle监听（一直下一步即可）