Python 请求——如何判断你是否收到 404
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Requests -- how to tell if you're getting a 404
提问by user1427661
I'm using the Requests library and accessing a website to gather data from it with the following code:
我正在使用请求库并访问网站以使用以下代码从中收集数据：
r = requests.get(url)
I want to add error testing for when an improper URL is entered and a 404 error is returned. If I intentionally enter an invalid URL, when I do this:
我想为输入不正确的 URL 并返回 404 错误添加错误测试。如果我故意输入一个无效的 URL，当我这样做时：
print r
I get this:
我明白了：
<Response [404]>
EDIT:
编辑：
I want to know how to test for that. The object type is still the same. When I do r.contentor r.text, I simply get the HTML of a custom 404 page.
我想知道如何测试。对象类型仍然相同。当我执行r.contentor 时r.text，我只是获取自定义 404 页面的 HTML。
采纳答案by Martijn Pieters
Look at the r.status_codeattribute:
if r.status_code == 404:
# A 404 was issued.
Demo:
演示：
>>> import requests
>>> r = requests.get('http://httpbin.org/status/404')
>>> r.status_code
404
If you want requeststo raise an exception for error codes (4xx or 5xx), call r.raise_for_status():
如果要requests针对错误代码（4xx 或 5xx）引发异常，请调用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.
You can also test the response object in a boolean context; if the status code is not an error code (4xx or 5xx), it is considered ‘true':
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“真”：
if r:
# successful response
If you want to be more explicit, use if r.ok:.
如果您想更明确，请使用if r.ok:.
