How to use the aioftp.ClientSession function in aioftp

async def test_no_server(loop, *args, **kwargs):

    async with aioftp.ClientSession("127.0.0.1", loop=loop):

        pass

async def prove(self):
        anonymous = False
        flag = 3
        usernamedic = self.read_file(self.parameter['U']) if 'U' in self.parameter.keys() else self.read_file(os.path.join(paths.DICT_PATH, 'ftp_usernames.txt'))
        passworddic = self.read_file(self.parameter['P']) if 'P' in self.parameter.keys() else self.read_file(os.path.join(paths.DICT_PATH, 'ftp_passwords.txt'))
        async for (username, password) in self.generate_dict(usernamedic, passworddic):
            try:
                if username == 'anonymous':
                    if anonymous:
                        continue
                    else:
                        anonymous = True
                async with aioftp.ClientSession(self.target_host, self.target_port, username, password) as client:
                    self.flag = 1
                    self.req.append({"username": username, "password": password})
                    self.res.append({"info": username + "/" + password, "key": "ftp burst"})
            except Exception as e:
                if "timed out" in str(e):
                    if flag == 0:
                        return
                    flag -= 1

async def get_ftp_listing(self, url):
        """Returns list of files at FTP **url**"""
        logger.debug("FTP: listing %s", url)
        if self.cache and url in self.cache["ftp_list"]:
            return self.cache["ftp_list"][url]

        parsed = urlparse(url)
        async with aioftp.ClientSession(parsed.netloc,
                                        password=self.USER_AGENT+"@") as client:
            res = [str(path) for path, _info in await client.list(parsed.path)]
        if self.cache:
            self.cache["ftp_list"][url] = res
        return res

async def get_checksum_from_ftp(self, url, _desc=None):
        """Compute sha256 checksum of content at ftp **url**

        Does not show progress monitor at this time (would need to
        get file size first)
        """
        parsed = urlparse(url)
        checksum = sha256()
        async with aioftp.ClientSession(parsed.netloc,
                                        password=self.USER_AGENT+"@") as client:
            async with client.download_stream(parsed.path) as stream:
                async for block in stream.iter_by_block():
                    checksum.update(block)
        return checksum.hexdigest()

async def get_ftp_listing(self, url):
        """Returns list of files at FTP **url**"""
        logger.debug("FTP: listing %s", url)
        if self.cache and url in self.cache["ftp_list"]:
            return self.cache["ftp_list"][url]

        parsed = urlparse(url)
        async with aioftp.ClientSession(parsed.netloc,
                                        password=self.USER_AGENT+"@") as client:
            res = [str(path) for path, _info in await client.list(parsed.path)]
        if self.cache:
            self.cache["ftp_list"][url] = res
        return res