Use this method to get information about one member of a chat.

        Args:
            chat_id (``int`` | ``str``):
                Unique identifier (int) or username (str) of the target chat.

            user_id (``int`` | ``str``)::
                Unique identifier (int) or username (str) of the target chat.
                For your personal cloud (Saved Messages) you can simply use "me" or "self".
                For a contact that exists in your Telegram address book you can use his phone number (str).

        Returns:
            On success, a :obj:`ChatMember <pyrogram.ChatMember>` object is returned.

        Raises:
            :class:`RPCError <pyrogram.RPCError>` in case of a Telegram RPC error.

def get_chat_member(
        self,
        chat_id: Union[int, str],
        user_id: Union[int, str]
    ) -> "pyrogram.ChatMember":
        """Use this method to get information about one member of a chat.

        Args:
            chat_id (``int`` | ``str``):
                Unique identifier (int) or username (str) of the target chat.

            user_id (``int`` | ``str``)::
                Unique identifier (int) or username (str) of the target chat.
                For your personal cloud (Saved Messages) you can simply use "me" or "self".
                For a contact that exists in your Telegram address book you can use his phone number (str).

        Returns:
            On success, a :obj:`ChatMember <pyrogram.ChatMember>` object is returned.

        Raises:
            :class:`RPCError <pyrogram.RPCError>` in case of a Telegram RPC error.
        """
        chat_id = self.resolve_peer(chat_id)
        user_id = self.resolve_peer(user_id)

        if isinstance(chat_id, types.InputPeerChat):
            full_chat = self.send(
                functions.messages.GetFullChat(
                    chat_id=chat_id.chat_id
                )
            )

            for member in pyrogram.ChatMembers._parse(self, full_chat).chat_members:
                if member.user.is_self:
                    return member
            else:
                raise UserNotParticipant
        elif isinstance(chat_id, types.InputPeerChannel):
            r = self.send(
                functions.channels.GetParticipant(
                    channel=chat_id,
                    user_id=user_id
                )
            )

            users = {i.id: i for i in r.users}

            return pyrogram.ChatMember._parse(self, r.participant, users)
        else:
            raise ValueError("The chat_id \"{}\" belongs to a user".format(chat_id))