服务器 ping - 在哪里以及如何修复 TypeError "argument of type 'classname' is not iterable"？

Question

在测试 here 处发布的服务器 ping 脚本时，我运行出现错误：

TypeError: argument of type 'MyCOM' is not iterable

查看解析为 subprocess.list2cmdline(seq) 的内容：已检查 seq：

parse result: ['ping', '-n', '192.168.0.2', '-w', '1000', <main.MyCOM object at 0x000002D26267F678>]

MyCOM 是类名。应该修复什么，如何以及在哪里工作？完整回溯：见下文。

我的 GUI 脚本：

    class MainGUI(etc...):
        def __init__(self, *args, parent=None):

            ...snippet...

            self.mycom_thread = MyCOM()
            self.mycom_thread.start()

            ...snippet...

    class MyCOM(QThread):

        def __init__(self, parent = None):
            QThread.__init__(self, parent)

            self.ping_okay = 0

        def ping(host_or_ip, packets=1, timeout=1000):
            ''' Calls system "ping" command, returns True if ping succeeds.
            Required parameter: host_or_ip (str, address of host to ping)
            Optional parameters: packets (int, number of retries), timeout (int, ms to wait for response)
            Does not show any output, either as popup window or in command line.
            Python 3.5+, Windows and Linux compatible (Mac not tested, should work)

            Credits to: SO user Jose Francisco Lopez Pimentel.
            '''
            # The ping command is the same for Windows and Linux, except for the "number of packets" flag.
            if platform.system().lower() == 'windows':
                print ('some text')
                command = ['ping', '-n', str(packets), '-w', str(timeout), host_or_ip]
                # run parameters: capture output, discard error messages, do not show window
                result = subprocess.run(command, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, creationflags=0x08000000)
                # 0x0800000 is a windows-only Popen flag to specify that a new process will not create a window.
                # On Python 3.7+, you can use a subprocess constant:
                #   result = subprocess.run(command, capture_output=True, creationflags=subprocess.CREATE_NO_WINDOW)
                # On windows 7+, ping returns 0 (ok) when host is not reachable; to be sure host is responding,
                # we search the text "TTL=" on the command output. If it's there, the ping really had a response.
                return result.returncode == 0 and b'TTL=' in result.stdout
            else:
                command = ['ping', '-c', str(packets), '-w', str(timeout), host_or_ip]
                # run parameters: discard output and error messages
                result = subprocess.run(command, stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
                return result.returncode == 0

        def run(self):

            check = 1
            IP = "192.168.0.2"

            while check == 1:
                print (self.ping(IP))

完整的回溯：

Traceback (most recent call last):
      File "mymain.py", line 1156, in run
        print (self.ping(IP))
      File "mymain.py", line 1137, in ping
        result = subprocess.run(command, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, creationflags=0x08000000)
      File "x\lib\subprocess.py", line 383, in run
        with Popen(*popenargs, **kwargs) as process:
      File "x\lib\subprocess.py", line 678, in __init__
        restore_signals, start_new_session)
      File "x\lib\subprocess.py", line 933, in _execute_child
        args = list2cmdline(args)
      File "x\lib\subprocess.py", line 443, in list2cmdline
        needquote = (" " in arg) or ("\t" in arg) or not arg
    TypeError: argument of type 'MyCOM' is not iterable
    Exception ignored in: <module 'threading' from 'x\lib\threading.py'>
    Traceback (most recent call last):
      File "x\lib\threading.py", line 1294, in _shutdown
        _main_thread._delete()
      File "x\lib\threading.py", line 1013, in _delete
        del _active[get_ident()]

Answer 1

要解决这种（显然是继承）类型的错误，应替换以下行：

def ping(host_or_ip, packets=1, timeout=1000):

来自

def ping(self, host_or_ip, packets=1, timeout=1000):

提供 self 作为第一个参数，否则继承将不正确并且提到的错误将返回给您。

服务器 ping - 在哪里以及如何修复 TypeError "argument of type 'classname' is not iterable"？

server ping - Where and how to fix the TypeError "argument of type 'classname' is not iterable"?

subprocess

ping

python-3.x

pyqt5