如何使用变量在字典中查找匹配的键并回传值？-编程知识-白鹭情

我正在尝试从字典中的键中获取值。我正在尝试匹配主机设备的已知指纹并回传相关值。我相信它没有正确解释变量，因为它有斜线。代码如下。

fingerprints = {
    'AAAABBBB': 'host1',
    'AAAA/CCC': 'tester',
    'AAAADDDD': 'plif'
    }

host_fingerprint = os.system("ssh-keyscan <ip of target> 2>&1 | grep ed25519 | cut -d ' ' -f 3")
    print(host_fingerprint)
    print(fingerprints['AAAA/CCC'])
    print(fingerprints[host_fingerprint])

前 2 个打印陈述句按预期作业，host_fingprint 的输出为 AAAA/CCC。如何正确使用变量来打印字典中的值？

尝试使用 subprocess.check_output 时，我得到

Getting error: 
Traceback (most recent call last):
  File "~/starkiller/starkiller.py", line 50, in <module>
    main()
  File "~/starkiller/starkiller.py", line 45, in main
    match_users()
  File "~/starkiller/starkiller.py", line 37, in match_users
    host_fingerprint = subprocess.check_output("ssh-keyscan 10.10.10.30 2>&1 | grep ed25519 | cut -d ' ' -f 3")
  File "/usr/lib/python3.9/subprocess.py", line 424, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.9/subprocess.py", line 505, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/lib/python3.9/subprocess.py", line 951, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.9/subprocess.py", line 1823, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: "ssh-keyscan <target IP> 2>&1 | grep ed25519 | cut -d ' ' -f 3"

最终的作业是在子流程的末尾添加几个部分，然后去除换行符。

keyscan = subprocess.check_output(["ssh-keyscan <target IP> 2>&1 | grep ed25519 | cut -d ' ' -f 3"], shell=True, universal_newlines=True)
    host_fingerprint = keyscan.strip()

uj5u.com热心网友回复：

你被愚弄了，认为它是按照终端上打印的方式作业的，但os.system不回传字符串。您执行的命令只是将其正常输出直接打印到 stdout，然后os.system回传数字退出代码 (0)。

这应该有效：

fingerprints = {
    'AAAABBBB': 'host1',
    'AAAA/CCC': 'tester',
    'AAAADDDD': 'plif'
    }

host_fingerprint = subprocess.check_output("ssh-keyscan <ip of target> 2>&1 | grep ed25519 | cut -d ' ' -f 3")
print(host_fingerprint)
print(fingerprints['AAAA/CCC'])
print(fingerprints[host_fingerprint])