login_url = "http://xxxx/api/auth/login"
login_data = {"username":"test3","password":"123456"}
login_res = requests.post(url=login_url,data = login_data)
token = login_res.json()["data"]["token"]

batch_url = "http://xxxx/api/models/batch"
batch_data = {"ids":"[4]","version_number":"[309]"}
headers = {"Authorization":"bearer %s" % token}
batch_res = requests.get(url=batch_url,params=batch_data,headers=headers)

file_path = batch_res.json()['data']['file_path']
file_name = batch_res.json()['data']['file_name']
down_url = "http://xxxx/api/report/down"
down_data = {"type":2,
? ? ? ? ? ? ?"file_path":file_path,
? ? ? ? ? ? ?"file_name":file_name,
? ? ? ? ? ? ?"token":token
? ? ? ? ? ? ?}
down_res = requests.get(url=down_url,params=down_data)
with open(file_name,"wb") as code:
? ? code.write(down_res.content)

def downloadfile(url,filename=None):
  if(not filename):							#如果參數沒有指定文件名
    filename=os.path.basename(url)			#取用url的尾巴為文件名
  leng=1
  while(leng==1):
    torrent=requests.get(url,headers=headers)
    leng=len(list(torrent.iter_content(1024)))  #下載區塊數
    if(leng==1):								#如果是1 就是空文件 重新下載
      print(filename,'下載失敗,重新下載')
      sleep(1)
    else:
      print(path,'下載完成')
  with open(filename,'wb') as f:				
    for chunk in torrent.iter_content(1024):	#防止文件過大，以1024為單位一段段寫入
      f.write(chunk)