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An optionally asynchronous multithreaded downloader for python

Project description


Multithread is an optionally asynchronous Python library for downloading files using several threads.


  • Lightweight: one file, a little over 100 lines of code excluding license
  • Extensive: the ability to pass your own sessions and your own arguments to each request means you don't need to wait for your desired feature to be implemented; anything you can do in aiohttp, you can do in multithread!
  • Fast: benefit from the speed of aiohttp and multithreaded downloading!



  • Python 3.5.3+
  • aiohttp
  • mosquito/aiofile
  • optional: tqdm

Use the package manager pip to install multithread.
For support for progress bars, install multithread[progress].

pip3 install multithread


import multithread

download_object = multithread.Download("", filename)

# passing headers (you can pass any other arguments that aiohttp.ClientSession.request can take as well)
download_object = multithread.Download("", filename, aiohttp_args={"headers": {"a": "b", "c": "d"}})



Downloader(self, url, file, threads=4, session=None, progress_bar=True, aiohttp_args={'method': 'GET'}, create_dir=True)

A multi-threaded downloader class using aiohttp


- url (str): The URL to download
- file (str, path-like object or AIOFile): The file to write the download to. if not an AIOFile, it's used as a path for one
- threads (int): The number of threads to use to download
- session (aiohttp.ClientSession): An existing session to use with aiohttp
- new_session (bool): True if a session was not passed, and the downloader created a new one
- progress_bar (bool): Whether to output a progress bar or not
- aiohttp_args (dict): Arguments to be passed in each aiohttp request. If you supply a Range header using this, it will be overwritten in fetch()



Calls asyncstart() synchronously



Re-initializes file and calls download() with it. Closes session if necessary


Downloader.fetch(self, fileobj, progress=False, filerange=(0, ''))

Individual thread for fetching files.


- fileobj (AIOFile): the file to write the download to
- progress (bool or tqdm.Progress): the progress bar (or lack thereof) to update
- filerange (tuple): the range of the file to get

download, fileobj)

Generates ranges and calls fetch() with them.


- fileobj (AIOFile): the file to write the download to


Any and all pull requests are welcome. As this is a small project, there are no strict standards, but please try to keep your code clean to a reasonable standard. Alternatively, if you would like to clean my code, that would be more than welcome!



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