A convenient function to download to a file using requests.

Basic usage:

url = "https://github.com/takluyver/requests_download/archive/master.zip"
download(url, "requests_download.zip")

An optional headers= parameter is passed through to requests.

Trackers are a lightweight way to monitor the data being downloaded. Two trackers are included:

• ProgressTracker - displays a progress bar, using the progressbar2 package.
• HashTracker - wraps a hashlib object to calculate a hash (e.g. sha256 or md5) of the file as you download it.

Here's an example of using both of them:

import hashlib
# progressbar is provided by progressbar2 on PYPI.
from progressbar import DataTransferBar
from requests_download import download, HashTracker, ProgressTracker

hasher = HashTracker(hashlib.sha256())
progress = ProgressTracker(DataTransferBar())

download('https://github.com/takluyver/requests_download/archive/master.zip',
         'requests_download.zip', trackers=(hasher, progress))

assert hasher.hashobj.hexdigest() == '...'

To make your own tracker, subclass TrackerBase and define any of these methods:

from requests_download import TrackerBase

class MyTracker(TrackerBase):
    def on_start(self, response):
        """Called with requests.Response object, which has response headers"""
        pass

    def on_chunk(self, chunk):
        """Called multiple times, with bytestrings of data received"""
        pass

    def on_finish(self):
        """Called when the download has completed"""
        pass