create or replace procedure test_msg(i_user in varchar2, o_msg out varchar2) is
begin
 o_msg := i_user ||', Good Morning!';
end;

import cx_Oracle as cx
conn = cx.connect('database connecting string')
cursor = conn.cursor()
#声明变量
user = 'Nick' ghCjQLCL#plsql入参
msg = cursor.var(cx_Oracle.STRING) #plsql出参
#调用存储过程
cursor.callproc('test_msg', [user, msg]) #['Nick', 'Nick, Good Morning!']
#打印返回值
print msg #<cx_Oracle.STRING with value 'Nick, Good Morning!'>
print msg.getvalue() #Nick, Good Morning!
#资源关闭
cursor.close()
conn.close()