FileNotFoundError：[WinError 2] python 3.4

Question

我试图通过python通过Plink自动接受ssh-rsa密钥。 但是我得到了错误

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)

但是我在行process1的Key（）函数中遇到错误。 下面是错误：

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 ，您将需要使用shell=True 。 这是因为echo不是独立的可执行文件，而是Windows命令行的内置命令。 范例-

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

另外，请注意，仅在绝对必要时才应使用shell=True （在这种情况下，请在子进程的Windows中使用echo ）。

---

虽然总的来说，您可以使用PIPE和.communicate()将y直接传递给第二个命令。 范例-

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')