python unittest装载、执行、造成报告

#执行用例
caselist = config.caselist
for i in range(0,len(caselist)):
    reportname = caselist[i][2:]
    now = config.now
    screenshotpath = config.screenshotpath
    def creatsuitel():
        os.mkdir(screenshotpath)
        testunit=suite.Suit()
        #discover 方法定义
        discover=unittest.defaultTestLoader.discover(caselist[i],pattern ='test_*.py',top_level_dir=None)
        #discover 方法筛选出来的用例，循环添加到测试套件中
        for test_suite in discover:
            for test_case in test_suite:
                print(test_case)
                testunit.addTests(test_case)
        return testunit
    alltestnames = creatsuitel()
    report = config.reportpaht + reportname  + now + '.html'
    fp = open(report, 'wb')
    runner =HTMLTestRunner.HTMLTestRunner(stream=fp,title=u'自动化测试报告',description=u'用例执行情况：')
    #执行测试用例
    runner.run(alltestnames)
    fp.close()

    #发送结果邮件，先压缩再发送
    # zip.zip_compression(config.reportpaht, config.reportpaht + "report.zip")
    # SentEmail.sentemail(config.reportpaht + "report.zip")