包装在Python的bash脚本 [英] Wrapping bash scripts in python

问题描述

我刚刚发现这个伟大的wget的包装，我想它改写为使用该子模块的Python脚本。然而，它原来是相当棘手给我的错误的种种。

I just found this great wget wrapper and I'd like to rewrite it as a python script using the subprocess module. However it turns out to be quite tricky giving me all sorts of errors.

download()
{
    local url=$1
    echo -n "    "
    wget --progress=dot $url 2>&1 | grep --line-buffered "%" | \
    sed -u -e "s,\.,,g" | awk '{printf("\b\b\b\b%4s", $2)}'

    echo -ne "\b\b\b\b"
    echo " DONE"
}

然后，它可以被称为是这样的：

Then it can be called like this:

file="patch-2.6.37.gz"
echo -n "Downloading $file:"
download "http://www.kernel.org/pub/linux/kernel/v2.6/$file"

任何想法？

来源： http://fitnr.com/showing-file-下载进度使用-wget.html

推荐答案

我觉得你并不遥远。主要是我想知道，为什么与运行管理会到的grep 和 SED 和 AWK 时，你可以做一切内部在Python？

I think you're not far off. Mainly I'm wondering, why bother with running pipes into grep and sed and awk when you can do all that internally in Python?

#! /usr/bin/env python

import re
import subprocess

TARGET_FILE = "linux-2.6.0.tar.xz"
TARGET_LINK = "http://www.kernel.org/pub/linux/kernel/v2.6/%s" % TARGET_FILE

wgetExecutable = '/usr/bin/wget'
wgetParameters = ['--progress=dot', TARGET_LINK]

wgetPopen = subprocess.Popen([wgetExecutable] + wgetParameters,
                             stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

for line in iter(wgetPopen.stdout.readline, b''):
    match = re.search(r'\d+%', line)
    if match:
        print '\b\b\b\b' + match.group(0),

wgetPopen.stdout.close()
wgetPopen.wait()

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