Python TypeError不支持％的操作数类型:' file'和' unicode'

我正在进行django字段验证，但无法弄清楚为什么我在本节中遇到类型错误:

I'm working on a django field validation and I can't figure out why I'm getting a type error for this section:

def clean_tid(self):
    data = self.cleaned_data['tid']
    stdout_handel = os.popen("/var/www/nsmweb/jre1.6.0_14/bin/java -jar /var/www/nsmweb/sla.jar -t %s grep -v DAN")  % data
    result = stdout_handel.read()

在将数据作为字符串变量传递之前，是否需要以某种方式转换数据?

Do I have to convert data somehow before I can pass it in as a string variable?