Question

我建立了一个看起来像这样的图书馆：

class AXISSetGet(object):

    def SSH_Start(self):
        cfg = yaml.load(open(config_file_path))
        HOST =  cfg['afo_axis_host']
        PORT = cfg['afo_axis_port']
        USERNAME = cfg['afo_axis_username']
        PASSWORD = cfg['afo_axis_password']

        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(hostname=HOST, port=PORT, username=USERNAME, password=PASSWORD)

    def Get_File (self,filename):
    # rest of the function

该类的所有其他函数都需要

SSH_Start（）函数。我试图在声明该类之前编写SSH_Start（），但是它不起作用。

有人可以帮我吗？谢谢！

Answer 1

您可以使用self来访问同一类的函数，我想这就是您想要的吗？

class AXISSetGet(object):

    def SSH_Start(self):
        cfg = yaml.load(open(config_file_path))
        HOST =  cfg['afo_axis_host']
        PORT = cfg['afo_axis_port']
        USERNAME = cfg['afo_axis_username']
        PASSWORD = cfg['afo_axis_password']

        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(hostname=HOST, port=PORT, username=USERNAME,password=PASSWORD)

    def Get_File (self,filename):
        self.SSH_Start()

Answer 2

添加SSH客户端作为实例属性，然后可以通过任何方法使用它。从您现有的代码来看，我不希望您多次调用SSH_Start方法，您只需要打开SSH连接即可。尝试类似的东西：

class AXISSetGet(object):
    def __init__(self):
        self.SSH_Start() # Call it here to ensure the connection has been made before it's needed.

    def SSH_Start(self):
        # config stuff

        ssh = paramiko.SSHClient()
        # ...
        self.ssh = ssh

    def Get_File (self,filename):
        self.ssh.use_client_here(...)

我很想在这里看看properties。这样，您第一次尝试使用客户端时，它将创建一个并进行连接，然后将现有客户端用于后续调用。像这样：

class AXISSetGet(object):
    def __init__(self):
        self._ssh = None

    @property
    def ssh(self):
        # if this is the first time the connection has been needed, create it
        if not self._ssh:
            # config stuff
            ssh = paramiko.SSHClient()
            # ...
            self._ssh = ssh
        # and then just return the existing one
        return self._ssh

    def Get_File (self,filename):
        self.ssh.use_client_here(...)

作为旁注，请通读PEP8，以获取有关命名约定和格式的准则。它不会改变代码的行为，但会使其他人更容易阅读和理解。

保持ssh连接处于活动状态

2 个答案: