PYTHON如何在内存中生成ZIP文件

class MemoryZipFile(object):
   def __init__(self):
       #创建内存文件
       self._memory_zip = StringIO.StringIO()
        
   def append_content(self, filename_in_zip, file_content):
       """
       description: 写文本内容到zip
       """
       zf = zipfile.ZipFile(self._memory_zip, "a", zipfile.ZIP_DEFLATED, False)
       zf.writestr(filename_in_zip, file_content)
       for zfile in zf.filelist: zfile.create_system = 0
       return self
         
   def append_file(self, filename_in_zip, local_file_full_path):
       """

        mem_zip_file = MemoryZipFile()
        mem_zip_file.append_content('mimetype', "application/epub+zip")
        mem_zip_file.append_content('META-INF/container.xml', '''<?xml version="1.0" encoding="UTF-8" ?>
<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container"> </container>''');
        #追加磁盘上的文件内容到内存，注意这里的第二个参数是本地磁盘文件的全路径(windows:c/demo/1.jpg | linux: /usr/local/test/1.jpg)
        mem_zip_file.append_file("1.jpg", "c:\1.jpg")
  
  
        #将内存中的zip文件写入磁盘
        mem_zip_file.write_file("c:test.zip")
  
        #获取内存zip文件内容
        data = mem_zip_file.read()
  
        #上传到fdfs
        my_fdfs_client.upload_by_buffer(data, 'zip')