4.测试超时异常处理

try:
    response=urllib.request.urlopen("http://httpbin.org/get",timeout=0.01)#如果0.01秒内数据没有响应就超时
    print(response.read().decode("utf-8"))
except utllib.error.URLError as e:
    print("time out")
    if hasattr(e,"code"):
        print(e.code)#状态码是多少
    if hasattr(e,"reason"):
        print(e.reason)#错误的原因是什么