看一下
r.status_pre属性：
if r.status_pre == 404: # A 404 was issued.
演示：
>>> import requests>>> r = requests.get('http://httpbin.org/status/404')>>> r.status_pre404如果要
requests引发错误代码（4xx或5xx）的异常，请致电
r.raise_for_status()：
>>> r = requests.get('http://httpbin.org/status/404')>>> r.raise_for_status()Traceback (most recent call last): File "<stdin>", line 1, in <module> File "requests/models.py", line 664, in raise_for_status raise http_errorrequests.exceptions.HTTPError: 404 Client Error: NOT FOUND>>> r = requests.get('http://httpbin.org/status/200')>>> r.raise_for_status()>>> # no exception raised.您还可以在布尔上下文中测试响应对象。如果状态代码不是错误代码（4xx或5xx），则将其视为“ true”：
if r: # successful response
如果要更明确，请使用
if r.ok:。
