django 下载文件

from django.http import StreamingHttpResponse 

def big_file_download(request):   

 # do something...    

    def file_iterator(file_name, chunk_size=512):        

        with open(file_name) as f:            

            while True:                

                c = f.read(chunk_size)                

                    if c:                    

                        yield c                

                    else:                    

                        break   

    the_file_name = "file_name.txt"   

    response = StreamingHttpResponse(file_iterator(the_file_name))    

    return response