从Python获取Errno请求ConnectionError吗？ [英] Get Errno from Python Requests ConnectionError?

问题描述

我正在使用以下方法捕获并打印Python Requests ConnectionErrors：

I'm catching and printing Python Requests ConnectionErrors fine with just this:

except requests.exceptions.ConnectionError as e:
    logger.warning(str(e.message))

它会打印出诸如：

HTTPSConnectionPool(host='10.100.24.16', port=443): Max retries exceeded with url: /api/datastores/06651841-bbdb-472a-bde2-689d8cb8da19 (Caused by <class 'socket.error'>: [Errno 61] Connection refused)

和

HTTPSConnectionPool(host='10.100.24.16', port=443): Max retries exceeded with url: /api/datastores/06651841-bbdb-472a-bde2-689d8cb8da19 (Caused by <class 'socket.error'>: [Errno 65] No route to host)

还有许多其他功能。我想知道的是，获得消息中显示的错误号的最好，最Python化的方法是什么？我希望有一个可靠的系统来捕获问题并向用户提供尽可能有用和相关的错误消息。据我所知，ConnectionError是BaseException的间接依赖者，除了BaseException提供的功能之外，没有添加任何新的属性或方法。我不愿意直接使用正则表达式，因为在我看来冒冒所有位置都以相同方式格式化所有错误消息的风险。

And many others. What I'm wondering is, what's the best, most Pythonic, way to get that errno that's displaying in the message? I'd like to have a reliable system for catching the issues and offering as helpful and relevant error message to the user as possible. As far as I can tell, ConnectionError is an indirect decedent of BaseException, with no new properties or methods being added beyond what BaseException offers. I'm hesitant to simply use regex because it seems to me I run the risk of assuming all error messages are formatted the same way in all localities.

推荐答案

我认为您可以使用 e.args [0] .reason.errno 来访问它。

I think you can access it using e.args[0].reason.errno.

这可能记录在某个地方，但是通常当我不得不追踪这样的东西时，我只需在控制台上尝试一下，然后进行一些挖掘。 （我使用IPython，因此很容易进行制表检查，但让我们尝试不使用它。）

This is probably documented somewhere, but usually when I have to track down something like this I just try it at the console and dig around a little bit. (I use IPython so it's easy to do tab-inspection, but let's try it without).

首先，让我们使用

import requests
try:
    requests.get("http://not.a.real.url/really_not")
except requests.exceptions.ConnectionError as e:
    pass

e 中的错误：

>>> e
ConnectionError(MaxRetryError("HTTPConnectionPool(host='not.a.real.url', port=80): Max retries exceeded with url: /really_not (Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known)",),)

信息通常在 args ：

>>> e.args
(MaxRetryError("HTTPConnectionPool(host='not.a.real.url', port=80): Max retries exceeded with url: /really_not (Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known)",),)
>>> e.args[0]
MaxRetryError("HTTPConnectionPool(host='not.a.real.url', port=80): Max retries exceeded with url: /really_not (Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known)",)

在里面看，我们看到：

>>> dir(e.args[0])
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__',
 '__getitem__', '__getslice__', '__hash__', '__init__', '__module__', '__new__',
 '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', '__sizeof__',
 '__str__', '__subclasshook__', '__unicode__', '__weakref__', 'args', 'message', 'pool',
 'reason', 'url']

原因看起来很鼓舞：

>>> e.args[0].reason
gaierror(-2, 'Name or service not known')
>>> dir(e.args[0].reason)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__',
 '__getitem__', '__getslice__', '__hash__', '__init__', '__module__', '__new__',
 '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', '__sizeof__',
 '__str__', '__subclasshook__', '__unicode__', '__weakref__', 'args', 'errno', 'filename',
 'message', 'strerror']
>>> e.args[0].reason.errno
-2

这篇关于从Python获取Errno请求ConnectionError吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！