python downloader

self.tmpdir = tempfile.mkdtemp()
with open(self.tmpdir+"\\"+fname, 'wb') as f:
    response = requests.get(url, stream=True)
    total = response.headers.get('content-length')
    if total is None:
        f.write(response.content)
    else:
        downloaded = 0
        total = int(total)
        for data in response.iter_content(chunk_size=max(int(total/1000), 1024*1024)):
            downloaded += len(data)
            f.write(data)