Исключение в деструкторе класса [закрыто] ⇐ Python

[Anonymous]

Я получаю исключение ImportError при выполнении кода:
from requests import Session

class web_client(object):
def __init__(self, adapter: type):
self.adapter = adapter
self.s = Session()
self.s.verify = False
self.adapter.auth(self)

def __del__(self):
self.adapter.close()
self.s.close()

class adapter(object):

@classmethod
def process(cls):
cls.client.s.get('https://stackoverflow.com')

@classmethod
def auth(cls, client: web_client):
cls.client = client
cls.process()

@classmethod
def close(cls):
cls.process() # exception here

if __name__ == "__main__":
web_client(adapter)

Почему этот код выдает ошибку и как ее избежать?
Exception ignored in:
Traceback (most recent call last):
File "C:\Users\me\Desktop\main.py", line 12, in __del__
File "C:\Users\me\Desktop\main.py", line 28, in close
File "C:\Users\me\Desktop\main.py", line 19, in process
File "C:\Anaconda3\lib\site-packages\requests\sessions.py", line 555, in get
File "C:\Anaconda3\lib\site-packages\requests\sessions.py", line 528, in request
File "C:\Anaconda3\lib\site-packages\requests\sessions.py", line 448, in prepare_request
File "C:\Anaconda3\lib\site-packages\requests\cookies.py", line 544, in merge_cookies
File "C:\Anaconda3\lib\site-packages\requests\cookies.py", line 352, in update
File "C:\Anaconda3\lib\copy.py", line 92, in copy
ImportError: sys.meta_path is None, Python is likely shutting down


Подробнее здесь: https://stackoverflow.com/questions/792 ... destructor