Question

我正在尝试分析未启动测试服务器时Requests返回的错误。

print("%s\n" % type(error))
<class 'requests.exceptions.ConnectionError'>

print("%s\n" % error)
HTTPConnectionPool(host='localhost', port=8080): Max retries exceeded with url: /test_soap (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fecf0892a90>: Failed to establish a new connection: [Errno 111] Connexion refusée'))

当我打开/usr/lib/python3.7/site-packages/requests/exceptions.py时，我可以看到ConnectionError类具有response和request属性：

print("%s\n" % error.response)
None

print("%s\n" % error.request)
<PreparedRequest [POST]>

但是我想访问urllib3.connection.HTTPConnection对象，以便打印Failed to establish a new connection错误消息。

在我打印该错误消息时，requests.exceptions.ConnectionError类的构建方式到底如何？

Answer 1

TL; DR 您不能。

至少不太好。

好处是您不应该，或者至少不需要。

考虑：

import requests

try:
    requests.get('http://localhost')
except Exception as error:
    print(error)
    print(type(error))
    print([o for o in dir(error) if not o.startswith('__')])

输出

# HTTPConnectionPool(host='localhost', port=80): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x0000019F34649C18>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))
# <class 'requests.exceptions.ConnectionError'>
# ['args', 'characters_written', 'errno', 'filename',
#  'filename2', 'request', 'response',
#  'strerror', 'winerror', 'with_traceback']

如果我们查看最后的输出，除了args之外，什么都没有突出：

print(error.args)

通常，这将是一个包含抛出的对象的元组：

# (MaxRetryError("HTTPConnectionPool(host='localhost', port=80): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x00000189C4D7AD30>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it'))"),)

从这里到基础urlib3异常的方式是丑陋且混乱的，并且并没有真正提供我们不知道的任何新信息：

print(error.args[0].reason.args[0])
# <urllib3.connection.HTTPConnection object at 0x0000023476C40390>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it

解析对象内容

1 个答案: