与TCPS ora28759连接：无法打开文件

Question

我正在使用下面的代码连接Oracle数据库

dsn_tns='(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = tcps)(HOST =hostdetails)(PORT =port))) (CONNECT_DATA = (SERVICE_NAME = servicename)))'

conn = cx.connect(user=USER, password=PW, dsn=dsn_tns)
print(cx.version)