从python运行dd并获得进展

Question

这是我的代码，但它不起作用。执行dd命令，但不打印输出。注意：如果我将标准输出更改为常规文本文件，则dd输出将逐步保存在dd打印输出的每个进度行的文件中。

想法？问候。

import sys
from subprocess import Popen, STDOUT, PIPE

with Popen(["dd", "if=/dev/cdrom", "of=/tmp/prova.iso", "bs=2048", "count=499472", "status=progress"], stderr=STDOUT, stdout=PIPE) as proc:
    print("ok")
    print(proc.stdout.read())

Answer 1

看看这个：dd with progress in python

Answer 2

我找到了解决方案。

import subprocess
import sys

cmd = ["dd", "if=/dev/cdrom", "of=/tmp/iso.iso", "bs=2048", "count=499472", "status=progress"]

process = subprocess.Popen(cmd, stderr=subprocess.PIPE)

line = ''
while True:
    out = process.stderr.read(1)
    if out == '' and process.poll() != None:
        break
    if out != '':
        s = out.decode("utf-8")
        if s == '\r':
            print(line)
            line = ''
        else:
            line = line + s

谢谢大家的答案。