download large size file from web

large_file_downloader.py

import requests, sys
from tqdm import tqdm

def download_file(url, local_filename):
    # NOTE the stream=True parameter below
    with requests.get(url, stream=True) as r:
        r.raise_for_status()
        with open(local_filename, 'wb') as f:
            for chunk in tqdm(r.iter_content(chunk_size=8192)): 
                if chunk: # filter out keep-alive new chunks
                    f.write(chunk)
                    # f.flush()
    return local_filename

if __name__ == '__main__':
    if len(sys.argv) != 3:
        print('Usages: python large_file_downloader.py url filename')
        exit(2)
    download_file(sys.argv[1], sys.argv[2])