Skip to main content
Join the official Python Developers Survey 2018 and win valuable prizes: Start the survey!

Download URLs using a compressed disk cache and a random throttling interval.

Project description

Each Downloader maintains an sqlite3-based disk cache that utilizes zlib

compression. Network requests are only made if the cached version of the resource has an age larger or equal to the stale_after value provided by the programmer.

Between network requests a throttling interval needs to elapse. This throttling interval is randomly chosen, but lies within the throttle_bounds defined by the programmer.

HTML resources can be parsed using lxml and in this case an lxml ElementTree is returned instead of a file object, with the links rewritten to be absolute in order to facilitate following them. The parsing is done leniently in order to not fail when invalid HTML is encountered.

The programmer can also supply a function that decides whether the server has banned the client (possibly by examining the returned resource). In this case an exception will be raised.

Downloader’s features make it ideal for writing scrapers, as it can keep its network footprint small (due to the cache) and irregular (due to the random throttling interval).

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
downloader-0.95.win32.exe (202.3 kB) Copy SHA256 hash SHA256 Windows Installer any Sep 24, 2014
downloader-0.95.zip (6.6 kB) Copy SHA256 hash SHA256 Source None Sep 24, 2014

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page