python - Flask 断线子进程 stdout python3

Question

我想在返回子进程命令的标准输出时有断线:

p = subprocess.Popen(['ping', site, '-c', '2'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
return (out)

实际上，我通过网页得到了此输出因为我正在使用 flask :

PING foo-bar (1.2.3.4) 56(84) bytes of data. 64 bytes from 1.2.3.4 (1.2.3.4): icmp_seq=1 ttl=54 time=15.3 ms 64 bytes from 1.2.3.4 (1.2.3.4): icmp_seq=2 ttl=54 time=14.3 ms --- foo-bar ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 14.334/14.848/15.363/0.528 ms

我想要这样的输出:

PING foo-bar (1.2.3.4) 56(84) bytes of data.

64 bytes from 1.2.3.4 (1.2.3.4): icmp_seq=1 ttl=54 time=16.4 ms

64 bytes from 1.2.3.4 (1.2.3.4): icmp_seq=2 ttl=54 time=13.6 ms

--- foo-bar ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 13.695/15.088/16.482/1.398 ms

这是路线的完整代码:

@app.route('/path/<action>', methods=['POST'])
def webping(action):
    if action == 'ping':
        site = request.form['site']
        r = re.match(r"^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|([a-zA-Z0-9][a-zA-Z0-9-_]{1,61}[a-zA-Z0-9]))\.([a-zA-Z]{2,6}|[a-zA-Z0-9-]{2,30}\.[a-zA-Z]{2,3})$", site)
        if r :
           p = subprocess.Popen(['ping', site, '-c', '2'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
           out, err = p.communicate()
           return (out.decode())
        else :
            return ('Error regex')

Answer 1

在 Python3 中，p.communicate() 将返回 bytes 对象。如果您将它们解码为字符串，我怀疑您会看到换行符按照您期望的方式处理。

print(out.decode())

我还猜测，当您将“实际”输出放入问题中时，换行符已被以某种方式删除。在我的终端中，我看到原始字节输出为

PING foo-bar (1.2.3.4) 56(84) bytes of data.\n64 bytes...