Python ssh会话未激活paramiko

我有一段代码，试图通过ssh使用Python的paramiko库连接到Windows机器。我第一次连接时，它是成功的。但是第二次，我得到错误“SSH会话未激活”。是因为我试图在两个不同的功能中使用它吗？代码如下所示：

class setup():#gets executed first
    @test.subsection
    def test_connection(self):
        #connecting first time
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect("8.29.9.131", username = "user", password = "pass")
        ssh.close()

class test1():#gets executed next
    @test.setup
    def setup(self): #runs first
        #connecting second time
        self.ssh = paramiko.SSHClient()
        self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        self.ssh.connect("8.29.9.131", username = "user", password = "pass")

    @test.maintest
    def main_test(self): #runs after setup section above
        in, out, err = self.ssh.exec_command("cmd /c C:\\\Python27\\\Scripts\\\module.py")
        print out.readlines()
        self.ssh.close()

2015-01-20T15:42:23: %test-ERROR:     stdin, stdout, stderr = self.ssh.exec_command("cmd /c C:\\\Python27\\\Scripts\\\module.py")
2015-01-20T15:42:23: %test-ERROR:   File "build/bdist.linux-     x86_64/egg/paramiko/client.py", line 341, in exec_command
2015-01-20T15:42:23: %test-ERROR:     chan = self._transport.open_session()
2015-01-20T15:42:23: %test-ERROR:   File "build/bdist.linux-x86_64/egg/paramiko/transport.py", line 615, in open_session
2015-01-20T15:42:23: %test-ERROR:     max_packet_size=max_packet_size)
2015-01-20T15:42:23: %test-ERROR:   File "build/bdist.linux-x86_64/egg/paramiko/transport.py", line 696, in open_channel
2015-01-20T15:42:23: %test-ERROR:     raise SSHException('SSH session not active')

回溯如下所示：

class setup():#gets executed first
    @test.subsection
    def test_connection(self):
        #connecting first time
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect("8.29.9.131", username = "user", password = "pass")
        ssh.close()

class test1():#gets executed next
    @test.setup
    def setup(self): #runs first
        #connecting second time
        self.ssh = paramiko.SSHClient()
        self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        self.ssh.connect("8.29.9.131", username = "user", password = "pass")

    @test.maintest
    def main_test(self): #runs after setup section above
        in, out, err = self.ssh.exec_command("cmd /c C:\\\Python27\\\Scripts\\\module.py")
        print out.readlines()
        self.ssh.close()

2015-01-20T15:42:23: %test-ERROR:     stdin, stdout, stderr = self.ssh.exec_command("cmd /c C:\\\Python27\\\Scripts\\\module.py")
2015-01-20T15:42:23: %test-ERROR:   File "build/bdist.linux-     x86_64/egg/paramiko/client.py", line 341, in exec_command
2015-01-20T15:42:23: %test-ERROR:     chan = self._transport.open_session()
2015-01-20T15:42:23: %test-ERROR:   File "build/bdist.linux-x86_64/egg/paramiko/transport.py", line 615, in open_session
2015-01-20T15:42:23: %test-ERROR:     max_packet_size=max_packet_size)
2015-01-20T15:42:23: %test-ERROR:   File "build/bdist.linux-x86_64/egg/paramiko/transport.py", line 696, in open_channel
2015-01-20T15:42:23: %test-ERROR:     raise SSHException('SSH session not active')

---

我没有使用您正在使用的测试框架，尽管在相当广泛的Python“unittest”框架中，我希望类似的代码可以工作，test1的self.ssh可供main_测试进一步使用。您还使用了一个非常旧的类系统，因为您没有我所期望的“类test1（object）”或更普通的“类TestSshToPc（unittest.TestCase）”。