看一下r.status_code属性：
if r.status_code == 404:
# A 404 was issued.
演示：
>>> import requests
>>> r = requests.get('http://httpbin.org/status/404')
>>> r.status_code
404
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_error
requests.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:。
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