Python urllib2 Progress Hook

本文介绍了Python urllib2 Progress Hook的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试使用urllib2 http客户端在python中创建下载进度条。我查看了API（以及谷歌），似乎urllib2不允许您注册进度挂钩。但是旧的已弃用的urllib确实具有此功能。

I am trying to create a download progress bar in python using the urllib2 http client. I've looked through the API (and on google) and it seems that urllib2 does not allow you to register progress hooks. However the older deprecated urllib does have this functionality.

有没有人知道如何使用urllib2创建进度条或报告挂钩？或者是否有其他一些黑客可以获得类似的功能？

Does anyone know how to create a progress bar or reporting hook using urllib2? Or are there some other hacks to get similar functionality?

推荐答案

这是一个完全有效的例子，它建立在Anurag的分块方法的基础上响应。我的版本允许您设置块大小，并附加任意报告功能：

Here's a fully working example that builds on Anurag's approach of chunking in a response. My version allows you to set the the chunk size, and attach an arbitrary reporting function:

import urllib2, sys def chunk_report(bytes_so_far, chunk_size, total_size): percent = float(bytes_so_far) / total_size percent = round(percent*100, 2) sys.stdout.write("Downloaded %d of %d bytes (%0.2f%%)\r" % (bytes_so_far, total_size, percent)) if bytes_so_far >= total_size: sys.stdout.write('\n') def chunk_read(response, chunk_size=8192, report_hook=None): total_size = response.info().getheader('Content-Length').strip() total_size = int(total_size) bytes_so_far = 0 while 1: chunk = response.read(chunk_size) bytes_so_far += len(chunk) if not chunk: break if report_hook: report_hook(bytes_so_far, chunk_size, total_size) return bytes_so_far if __name__ == '__main__': response = urllib2.urlopen('www.ebay'); chunk_read(response, report_hook=chunk_report)