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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def download_as_file(self, url: str, folder: Path, name: str, delay: float = 0) -> str: """ Download the given url to the given target folder. :param url: link :type url: str :param folder: target folder :type folder: ~pathlib.Path :param name: target file name :type name: str :param delay: after download wait in seconds :type delay: float :return: url :rtype: str :raises ~urllib3.exceptions.HTTPError: if the connection has an error """

        while folder.joinpath(name).exists():  # TODO: handle already existing files
            self.log.warning('already exists: ' + name)
            name = name + '_d'

        with self._downloader.request('GET', url, preload_content=False, retries=urllib3.util.retry.Retry(3)) as reader:
            if reader.status == 200:
                with folder.joinpath(name).open(mode='wb') as out_file:
                    out_file.write(reader.data)
            else:
                raise HTTPError(f"{url} | {reader.status}")

        if delay > 0:
            time.sleep(delay)

        return url