HTMLTestRunner生成空白resault.html

发现一奇葩问题，用idle或pyscripter执行脚本，生成的是空白html，通过cmd，进入脚本目录执行python xx.py，却能生成测试报告。

HTMLTestRunner 例子

#coding=utf-8
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException
import unittest, time, re
import HTMLTestRunner


class My_Test_Suite(unittest.TestCase):
    u'''打印百度、google标题'''
    def setUp(self):
        self.driver = webdriver.Ie()
        self.driver.implicitly_wait(30)
        self.verificationErrors = []
        self.accept_next_alert = True

    def test_baidu(self):
        u'''打开百度'''
        driver = self.driver
        driver.get("http://www.baidu.com")
        print u'当前网页是:',driver.title
        driver.close()

    def test_google(self):
        u'''打开google'''
        driver = self.driver
        driver.get("http://www.google.com.hk")
        print u'当前网页是:',driver.title

    def tearDown(self):
        self.driver.quit()
        self.assertEqual([], self.verificationErrors)

if __name__ == "__main__":

    #定义一个单元测试容器
    testunit=unittest.TestSuite()

    #将测试用例加入到测试容器中
    testunit.addTest(My_Test_Suite("test_baidu"))
    testunit.addTest(My_Test_Suite("test_google"))

    #定义个报告存放路径，支持相对路径
    filename = 'G:\seleniums\result.html'

    fp = file(filename, 'wb')
    #定义测试报告
    runner =HTMLTestRunner.HTMLTestRunner(stream=fp,title=u'测试报告',description=u'用例执行详情:：')

    #运行测试用例
    runner.run(testunit)