python - 文件未找到错误 : [WinError 2] python 3. 4

Question

我正在尝试通过 python 通过 Plink 自动接受 ssh-rsa key 。但我收到错误

下面是我的代码

def __init__(self, ipaddress, option, user, password, command=""):
    """
    Constructor creates the connection to the host.
    """
    self.ipaddress = ipaddress
    self.option = option
    self.user = user
    self.password = password
    self.command = command
    self.key()

def key(self):
    command1 = ['echo', 'y']
    process1 = subprocess.Popen(command1,stdout=subprocess.PIPE)
    command2 = ['plink', '-ssh', self.option, '-pw', self.password, '%s@%s'%(self.user, self.ipaddress), '\"exit\"']
    process2 = subprocess.Popen(command2,stdin=process1.stdout,stdout=subprocess.PIPE)

def sendSingleCommand(self, command):
    """
    Set up a ssh connection a device, send command, close connection and return stdout,stderr tuple.
    """
    try:
        print("plink -ssh %s -pw %s %s@%s %s" \
                % (self.option, self.password, self.user, self.ipaddress, command))
        self.process = subprocess.Popen("plink -ssh %s -pw %s %s@%s %s" \
                % (self.option, self.password, self.user, self.ipaddress, command), shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE)

但是我在 process1 行的 Key() 函数中遇到错误。以下是错误:

File "C:\Python34\lib\subprocess.py", line 859, in __init__  
Error:     restore_signals, start_new_session)  
Error:   File "C:\Python34\lib\subprocess.py", line 1112, in _execute_child  
Error:     startupinfo)  
Error: FileNotFoundError: [WinError 2] The system cannot find the file specified  

Answer 1

在 Windows 中，要在子进程中使用 echo ，您需要使用 shell=True 。这是因为 echo 不是一个单独的可执行文件，而是 Windows 命令行的内置命令。示例-

process1 = subprocess.Popen(command1,stdout=subprocess.PIPE,shell=True)

另外，请注意，只有在绝对必要时才应使用 shell=True (如本例中，在子进程的窗口中使用 echo)。

<小时/>

尽管作为一个整体，您可以使用 PIPE 和 .communicate() 将 y 直接传递到第二个命令。示例-

def key(self):
    command2 = ['plink', '-ssh', self.option, '-pw', self.password, '%s@%s'%(self.user, self.ipaddress), '\"exit\"']
    process2 = subprocess.Popen(command2,stdin=subprocess.PIPE,stdout=subprocess.PIPE)
    output, _ = process.communicate(b'y')