def requestAvatar(avatarId, mind, *interfaces):
        """
        Return avatar which provides one of the given interfaces.

        @param avatarId: a string that identifies an avatar, as returned by
            L{ICredentialsChecker.requestAvatarId<twisted.cred.checkers.ICredentialsChecker.requestAvatarId>}
            (via a Deferred).  Alternatively, it may be
            C{twisted.cred.checkers.ANONYMOUS}.
        @param mind: usually None.  See the description of mind in
            L{Portal.login}.
        @param interfaces: the interface(s) the returned avatar should
            implement, e.g.  C{IMailAccount}.  See the description of
            L{Portal.login}.

        @returns: a deferred which will fire a tuple of (interface,
            avatarAspect, logout), or the tuple itself.  The interface will be
            one of the interfaces passed in the 'interfaces' argument.  The
            'avatarAspect' will implement that interface.  The 'logout' object
            is a callable which will detach the mind from the avatar.
        """

        Return avatar which provides one of the given interfaces.

        @param avatarId: a string that identifies an avatar, as returned by
            L{ICredentialsChecker.requestAvatarId<twisted.cred.checkers.ICredentialsChecker.requestAvatarId>}
            (via a Deferred).  Alternatively, it may be
            C{twisted.cred.checkers.ANONYMOUS}.
        @param mind: usually None.  See the description of mind in
            L{Portal.login}.
        @param interfaces: the interface(s) the returned avatar should
            implement, e.g.  C{IMailAccount}.  See the description of
            L{Portal.login}.

        @returns: a deferred which will fire a tuple of (interface,
            avatarAspect, logout), or the tuple itself.  The interface will be
            one of the interfaces passed in the 'interfaces' argument.  The
            'avatarAspect' will implement that interface.  The 'logout' object
            is a callable which will detach the mind from the avatar.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/cred/portal.py