python - 如何在 Python 中解析 Linux 终端错误消息？

Question

我已经编写了一个小的 Python 代码来测试一个更大的项目。如果一切正常，子流程工作得很好。但我想分析特定错误的输出错误消息，这样我就可以找出错误是什么，例如 IP 不在网络中，或者用户名错误，密码错误。甚至最后的打印也不起作用。然而，我的兴趣是不打印那些。我只是在检查解析是否有效!

import sys
import subprocess
import os 
ip = "192.168.1.20"
password = "password"
username = "sam"
ans = subprocess.check_output(['sudo','xfreerdp','-p',password, ip])
    for line in ans.split('\n'):
        if "protocol security negotiation" in line:
            print "Not Windows!"
print "JUST TO test if this print works and it doesnt!!"

Answer 1

尝试使用 try..except

import sys
import subprocess
import os 
ip = "192.168.1.20"
password = "password"
username = "sam"
try:
    ans = subprocess.check_output(['sudo','xfreerdp','-p',password, ip])
except subprocess.CalledProcessError as e:
    ans = e.output
for line in ans.split('\n'):
    if "protocol security negotiation" in line:
        print "Not Windows!"
print "JUST TO test if this print works and it doesnt!!"