我在使用python连接oracle12.2.2的时候，报以下错误：
cx_Oracle.DatabaseError: ORA-12514: TNS:listener does not currently know of service requested in connect descriptorcx_Or
阅读背景：
cx_Oracle.DatabaseError: ORA-12514: TNS:listener does not currently know of service requested in con_quanqxj的博客
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