解压缩用python压缩的文件给出错误＆＃34;无法展开file.zip＆＃34;

Question

在我们网站上下载文件后，我们会用它压缩自述文件和教程文件。下载一些文件后，我收到此错误：

Unable to expand "File.zip" into "Downloads"

以下代码。任何想法为什么这可能只发生在一些文件而不是其他文件？它可能与文件本身的内容有关吗？

if len(output_streams) > 1:
    # If we have multiple files, then package them up since we can only return one
    upload_name = file_key + '.zip'

    # Create a new stream and write to it
    write_stream = StringIO()

    zip_file = ZipFile(write_stream, "a")
    for ext_name, stream in output_streams.iteritems():
        if '.' in ext_name:
            zip_file.writestr(ext_name, stream.getvalue().encode('utf-8','ignore'))
        else:
            zip_file.writestr(file_key + '.' + ext_name, stream.getvalue().encode('utf-8','ignore'))

    #adding the readme file
    try:
        if 'ManufacturerName' in manuf['manufacturer']:
            zip_file.writestr('how-to-import.htm', "<script>window.location = 'https://www.example.com/manufacturer/';</script>")
        else:
            zip_file.writestr('how-to-import.htm', "<script>window.location = 'https://www.example.com/about/import/';</script>")
    except:
        zip_file.writestr('how-to-import.htm', "<script>window.location = 'https://www.example.com/about/import/';</script>")
    zip_file.close()