code: def get_chat_member(
          self,
          chat_id: Union[int, str],
          user_id: Union[int, str]
      ) -> "pyrogram.ChatMember":
          
          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))
docs: 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.