下面的Python指令碼中利用request下載檔案並寫入到檔案系統，利用progressbar模組顯示下載進度條。

其中利用request模組下載檔案可以直接下載，不需要使用open方法，例如：

import urllib
import requests.packages.urllib3

requests.packages.urllib3.disable_warnings()

url = "https://raw.githubusercontent.com/racaljk/hosts/master/hosts"
urllib.urlretrieve(url,filename="hosts")

下面的例子是題目中完整的例子，其中註釋的部分是進度條的另一種寫法，顯示當前處理過的行數。

#!/usr/bin/python
# encoding: utf-8
# -*- coding: utf8 -*-
"""
Created by PyCharm.
File:        LinuxBashShellScriptForOps:download_file2.py
User:        Guodong
Create Date:    2016/9/14
Create Time:    9:40
 """
import requests
import progressbar
import requests.packages.urllib3

requests.packages.urllib3.disable_warnings()

url = "https://raw.githubusercontent.com/racaljk/hosts/master/hosts"

response = requests.request("GET",url,stream=True,data=None,headers=None)

save_path = "/tmp/hosts"

total_length = int(response.headers.get("Content-Length"))
with open(save_path,'wb') as f:
  # widgets = ['Processed: ',progressbar.Counter(),' lines (',progressbar.Timer(),')']
  # pbar = progressbar.ProgressBar(widgets=widgets)
  # for chunk in pbar((i for i in response.iter_content(chunk_size=1))):
  #   if chunk:
  #     f.write(chunk)
  #     f.flush()

  widgets = ['Progress: ',progressbar.Percentage(),' ',progressbar.Bar(marker='#',left='[',right=']'),progressbar.ETA(),progressbar.FileTransferSpeed()]
  pbar = progressbar.ProgressBar(widgets=widgets,maxval=total_length).start()
  for chunk in response.iter_content(chunk_size=1):
    if chunk:
      f.write(chunk)
      f.flush()
    pbar.update(len(chunk) + 1)
  pbar.finish()

執行結果：

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