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我正在尝试使用python脚本访问Oracle数据库表。我写了以下代码：

 import cx_Oracle

 con = cx_Oracle.connect("system/infy123@127.0.0.1/XE")
 cur = con.cursor()
 cur.execute(" SELECT * FROM SUPPLIER")
 for row in cursor.fetchall(): 
      print(row)

输出为：

Traceback (most recent call last):
  File "C:/Users/ADMIN/AppData/Local/Programs/Python/Python36- 
32/my_file.py", line 6, in <module>
    cur.execute(" SELECT * FROM SUPPLIER")
cx_Oracle.DatabaseError: ORA-00942: table or view does not exist

谁能告诉我如何解决这个错误？