python 实现下载大文件

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#coding:utf-8 import requests   def request_big_data(url):     name = url.split('/')[-1]     r = requests.get(url,stream=True) #stream =True 设置为流读取     with open("download/{}".format(name),'wb') as fd:         for chunk in r.iter_content(chunk_size=1024):             if chunk:fd.write(chunk)   request_big_data("http://www.test.com/test.md")