Downloader

class parfive.Downloader(max_conn=5, max_splits=5, progress=True, overwrite=False, config=None)

Bases: object

Download files in parallel.

Parameters:

• max_conn (int, default: 5) – The number of parallel download slots.

• max_splits (int, default: 5) – The maximum number of splits to use to download a file (server dependent).

• progress (bool, default: True) – If True show a main progress bar showing how many of the total files have been downloaded. If False, no progress bars will be shown at all.

• overwrite (Union[bool, Literal['unique']], default: False) – Determine how to handle downloading if a file already exists with the same name. If False the file download will be skipped and the path returned to the existing file, if True the file will be downloaded and the existing file will be overwritten, if 'unique' the filename will be modified to be unique.

• config (Optional[SessionConfig], default: None) – A config object containing more complex settings for this Downloader instance.

Attributes Summary

queued_downloads

The total number of files already queued for download.

Methods Summary

download()	Download all files in the queue.
enqueue_file(url[, path, filename, overwrite])	Add a file to the download queue.
retry(results)	Retry any failed downloads in a results object.
run_download()	Download all files in the queue.
simple_download(urls, *[, path, overwrite])	Download a series of URLs to a single destination.

Attributes Documentation

queued_downloads

The total number of files already queued for download.

Methods Documentation

download()

Download all files in the queue.

Returns:

parfive.Results – A list of files downloaded.

Notes

This is a synchronous version of run_download, an asyncio event loop will be created to run the download (in it’s own thread if a loop is already running).

enqueue_file(url, path=None, filename=None, overwrite=None, **kwargs)

Add a file to the download queue.

Parameters:

• url (str) – The URL to retrieve.

• path (Union[str, PathLike, None], default: None) – The directory to retrieve the file into, if None defaults to the current directory.

• filename (Union[str, Callable[[str, Optional[ClientResponse]], PathLike], None], default: None) – The filename to save the file as. Can also be a callable which takes two arguments the url and the response object from opening that URL, and returns the filename. (Note, for FTP downloads the response will be None.) If None the HTTP headers will be read for the filename, or the last segment of the URL will be used.

• overwrite (Union[bool, Literal['unique'], None], default: None) – Determine how to handle downloading if a file already exists with the same name. If False the file download will be skipped and the path returned to the existing file, if True the file will be downloaded and the existing file will be overwritten, if 'unique' the filename will be modified to be unique. If None the value set when constructing the Downloader object will be used.

• kwargs (dict) – Extra keyword arguments are passed to aiohttp.ClientSession.request or aioftp.Client.context depending on the protocol.

retry(results)

Retry any failed downloads in a results object.

Note

This will start a new event loop.

Parameters:

results (parfive.Results) – A previous results object, the .errors property will be read and the downloads retried.

Returns:

parfive.Results – A modified version of the input results with all the errors from this download attempt and any new files appended to the list of file paths.

async run_download()

Download all files in the queue.

Returns:

parfive.Results – A list of files downloaded.

classmethod simple_download(urls, *, path='./', overwrite=None)

Download a series of URLs to a single destination.

Parameters:

• urls (iterable) – A sequence of URLs to download.

• path (pathlib.Path, optional) – The destination directory for the downloaded files. Defaults to the current directory.

• overwrite (bool, optional) – Overwrite the files at the destination directory. If False the URL will not be downloaded if a file with the corresponding filename already exists.

Returns:

parfive.Results – A list of files downloaded.