Custom cache for oauth2 tokens

Hello,
I have a flask app, which uses trino python client to query the data from my trino servers and I have enabled oatuh2 authentication against my azure active directory, currently, the token is caching per host, I need to have it cached per user who authenticates on the front end of my web application. I have implemented my custom cache below and it is working as per my use case, but I prefer not to change any private properties as it's not the best practice.

from  flask import session


class _CustomCache(_OAuth2TokenCache):
    """
    In-memory token cache implementation. The token is stored per user.
    """

    def __init__(self):
        self._cache = {}
    def get_token_from_cache(self, host: str) -> Optional[str]:
        userName=session['user']   
        return self._cache.get(userName)

    def store_token_to_cache(self, host: str, token: str) -> None:
        userName=session['user']  
        self._cache[userName] = token
    


temp=OAuth2Authentication()
temp._bearer._token_cache=_CustomCache()


conn=connect(

    host='******',
    port=443,
    auth=temp,
    http_scheme="https"  
)

cursor=conn.cursor()

Start by tracing OAuth2Authentication, _OAuth2TokenCache, and the _bearer._token_cache assignment shown in the report. Confirm how the current host-keyed cache is reached, then determine the supported configuration boundary for user-scoped caching without private properties. Done should include coverage showing separate users receive the correct cached tokens.