Pfthb

I'm trying to parse an error that Requests returns when my test server is not started.

print("%sn" % type(error))
<class 'requests.exceptions.ConnectionError'>

print("%sn" % 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'))

When I open /usr/lib/python3.7/site-packages/requests/exceptions.py I can see the ConnectionError class has a response and request attributes:

print("%sn" % error.response)
None

print("%sn" % error.request)
<PreparedRequest [POST]>

But I would like to access to the urllib3.connection.HTTPConnection object so I can print the Failed to establish a new connection error message.

How exactly the requests.exceptions.ConnectionError class is built to show this error message when I print it?

TL;DR You can't.

Not nicely at least.

The good thing is that you shouldn't, or at least you don't need to.

Consider:

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('__')])

outputs

# 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']

If we look at the last output, nothing really stands out except for args:

print(error.args)

As usual, this will be a tuple that will contain the thrown object:

# (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'))"),)

From here the way to the underlying urlib3 exception is ugly and messy, and does not really give us any new info we didn't already know:

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