·http://www.python-requests.org/en/master/
requests.get(url,params=None,**kwargs)
requests.head(url,**kwargs)
requests.post(url,data=None,json=None,**kwargs)
request.put(url,data=Nones,**kwargs)
request.patch(url,data=Nones,**kwargs)
requests.delete(url,**kwargs)
修改user-agent
下载图片
