Parfive is a small library for downloading files, its objective is to provide a simple API for queuing files for download and then providing excellent feedback to the user about the in progress downloads. It also aims to provide a clear interface for inspecting any failed downloads.
The parfive package was motivated by the needs of SunPy’s
net submodule, but should be generally applicable to anyone who wants a user friendly way of downloading multiple files in parallel.
Parfive supports downloading files over either HTTP or FTP using aiohttp and aioftp
aioftp is an optional dependency, which does not need to be installed to download files over HTTP.
parfive can be installed via pip:
pip install parfive
or with FTP support:
pip install parfive[ftp]
or with conda from conda-forge:
conda install -c conda-forge parfive
or from GitHub.
parfive works by creating a downloader object, queuing downloads with it and then running the download.
parfive has a synchronous API, but uses
asyncio to parallelise 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()
It’s also possible to download a list of URLs to a single destination using the
from parfive import Downloader files = Downloader.simple_download(['http://184.108.40.206/5MB.zip' 'http://220.127.116.11/10MB.zip'], path="./")
Parfive also bundles a CLI. The following example will download the two files concurrently:
$ parfive 'http://18.104.22.168/5MB.zip' 'http://22.214.171.124/10MB.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.
Download files in parallel.
The results of a download from
Class Inheritance Diagram¶
To facilitate debugging parfive reads the following environment variables:
PARFIVE_SINGLE_DOWNLOAD- If set (to any value) this variable sets
max_splitsto one; meaning that no parallelisation of the downloads will occur.
PARFIVE_DISABLE_RANGE- If set (to any value) this variable will set
max_splitsto one; meaning that each file downloaded will only have one concurrent connection, although multiple files may be downloaded simultaneously.
PARFIVE_OVERWRITE_ENABLE_AIOFILES- If set (to any value) and aiofiles is installed in the system, aiofiles will be used to write files to disk.
PARFIVE_DEBUG- If set (to any value) will configure the built-in Python logger to log to stderr and set parfive, aiohttp and aioftp to debug levels.
See GitHub Releases for the release history and changelog.