def download_file(url, file_pname, chunk_size=1024*4):

    """

    url: file url

    file_pname: file save path

    chunk_size: chunk size

    """

    # 第一种

    response_data_file = requests.get(url, stream=True)

    with open(file_pname, 'wb') as f:

        for chunk in response_data_file.iter_content(chunk_size=chunk_size):

            if chunk:

                f.write(chunk)

    # 第二种

    with requests.get(url, stream=True) as req:

        with open(file_pname, 'wb') as f:

            for chunk in req.iter_content(chunk_size=chunk_size):

                if chunk:

                    f.write(chunk)