Python 进度条和下载 [英] Python progress bar and downloads

问题描述

我有一个 Python 脚本，可以启动一个可下载文件的 URL.有没有办法让 Python 显示下载进度而不是启动浏览器?

I have a Python script that launches a URL that is a downloadable file. Is there some way to have Python display the download progress as oppose to launching the browser?

推荐答案

我刚刚为此编写了一个超级简单(略显笨拙)的方法，用于从某个站点抓取 PDF.请注意，它只能在基于 Unix 的系统(Linux、mac os)上正常工作，因为 PowerShell 不处理 "\r":

I've just written a super simple (slightly hacky) approach to this for scraping PDFs off a certain site. Note, it only works correctly on Unix based systems (Linux, mac os) as PowerShell does not handle "\r":

import sys
import requests

link = "http://indy/abcde1245"
file_name = "download.data"
with open(file_name, "wb") as f:
    print("Downloading %s" % file_name)
    response = requests.get(link, stream=True)
    total_length = response.headers.get('content-length')

    if total_length is None: # no content length header
        f.write(response.content)
    else:
        dl = 0
        total_length = int(total_length)
        for data in response.iter_content(chunk_size=4096):
            dl += len(data)
            f.write(data)
            done = int(50 * dl / total_length)
            sys.stdout.write("\r[%s%s]" % ('=' * done, ' ' * (50-done)) )    
            sys.stdout.flush()

它使用请求库，因此您需要安装它.这会在您的控制台中输出类似以下内容:

It uses the requests library so you'll need to install that. This outputs something like the following into your console:

>下载download.data

>Downloading download.data

>[============ ]

>[=============                            ]

脚本中的进度条有 52 个字符宽(2 个字符只是 []，所以 50 个字符的进度).每个 = 代表下载量的 2%.

The progress bar is 52 characters wide in the script (2 characters are simply the [] so 50 characters of progress). Each = represents 2% of the download.

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