python简单的验证访问url

#!/usr/bin/python
import sys
import os
fp = open("query.txt","r")
alllines = fp.readlines()
fp.close()
for eachline in alllines:
        cmd = "curl "+eachline
        result_file=open("res.txt","w")
        stringres = os.popen(cmd).read()
        result_file.write(stringres)
        result_file.close()