瓶断线子标准输出python3

Question

我想有断线，而返回的子命令的标准输出：

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

其实我通过网页有这样的输出，因为我使用烧瓶：

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 

我想输出是这样的：

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 

下面是路由的全码：

@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 p.communicate()将返回bytes对象。如果你将它们解码为字符串，我怀疑你会看到你所期待的换行符处理。

print(out.decode()) 

我还猜测，当你在你的问题中放置“实际”输出时，换行符会以某种方式被删除。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...