def _http_download(url, target):
# https://stackoverflow.com/questions/16694907/download-large-file-in-python-with-requests
with requests.get(url, stream=True) as r:
r.raise_for_status()
with open(target, 'wb') as f:
for chunk in r.iter_content(chunk_size=8192):
# If you have chunk encoded response uncomment if
# and set chunk_size parameter to None.
#if chunk:
f.write(chunk)
解压：
shutil.unpack_archive(down_file, app_work_dir, format='tar')
