下面的Python脚本中利用request下载文件并写入到文件系统，利用progressbar模块显示下载进度条。
其中利用request模块下载文件可以直接下载，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")
下面的例子是题目中完整的例子，其中注释的部分是进度条的另一种写法，显示当前处理过的行数。
#!/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()
运行结果：
