Parfive

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A parallel file downloader using asyncio. parfive can handle downloading multiple files in parallel as well as downloading each file in a number of chunks.

Usage

.. image:: https://asciinema.org/a/EuALahgkiicWHGmrfFsZSLz81.svg :alt: asciicast demo of parfive :target: https://asciinema.org/a/EuALahgkiicWHGmrfFsZSLz81

parfive works by creating a downloader object, appending files to it and then running the download. parfive has a synchronous API, but uses asyncio to paralellise downloading the files.

A simple example is::

from parfive import Downloader dl = Downloader() dl.enqueue_file("http://data.sunpy.org/sample-data/predicted-sunspot-radio-flux.txt", path="./") files = dl.download()

Parfive also bundles a CLI. The following example will download the two files concurrently.::

$ parfive 'http://212.183.159.230/5MB.zip' 'http://212.183.159.230/10MB.zip' $ parfive --help usage: parfive [-h] [--max-conn MAX_CONN] [--overwrite] [--no-file-progress] [--directory DIRECTORY] [--print-filenames] URLS [URLS ...]

Parfive, the python asyncio based downloader

positional arguments: URLS URLs of files to be downloaded.

optional arguments: -h, --help show this help message and exit --max-conn MAX_CONN Number of maximum connections. --overwrite Overwrite if the file exists. --no-file-progress Show progress bar for each file. --directory DIRECTORY Directory to which downloaded files are saved. --print-filenames Print successfully downloaded files's names to stdout.

Results ^^^^^^^

parfive.Downloader.download returns a parfive.Results object, which is a list of the filenames that have been downloaded. It also tracks any files which failed to download.

Handling Errors ^^^^^^^^^^^^^^^

If files fail to download, the urls and the response from the server are stored in the Results object returned by parfive.Downloader. These can be used to inform users about the errors. (Note, the progress bar will finish in an incomplete state if a download fails, i.e. it will show 4/5 Files Downloaded).

The Results object is a list with an extra attribute errors, this property returns a list of named tuples, where these named tuples contains the .url and the .response, which is a aiohttp.ClientResponse or a aiohttp.ClientError object.