在我的Python脚本中使用Pexpect时出现错误“ NameError：名称'ExceptionPexpect'未定义”

Question

I tried to run following piece of code on my server,

import pexpect
import pxssh
import getpass
s = pxssh.pxssh()
hostname = raw_input("hostname:" )
username = raw_input("Username:" )
password = getpass.getpass("password:" )
if not s.login('hostname', 'Username', 'password'):
      print ("SSH login failed")
      print str(s)

else:
      print ("You logged in successfully")
      s.sendline('uptime')
      s.prompt()
      print s.before
      s.exit()

But, Whenever I try to execute the code, I see following error message,

   Traceback (most recent call last):
   File "pexpect.py", line 1, in <module>
      import pexpect
   File "/export/rahul_lab/Python/pexpect.py", line 2, in <module>
      import pxssh
   File "/usr/lib/python2.6/site-packages/pxssh.py", line 14, in <module>
      class ExceptionPxssh(ExceptionPexpect):
      NameError: name 'ExceptionPexpect' is not defined

Can somebody guide, what is the issue here and why am I getting this error all the time?

Answer 1

The problem is that you have a pexpect.py file in your working directory. (Maybe even this very script?)

That hides the pexpect module that you've installed to your site-packages. Which pxssh needs.

The solution is to rename your pexpect.py file to something different. And check if there's a pexpect.pyc or pexpect.pyo left behind and, if so, delete those.

---

Of course I'm assuming you actually installed pexpect to your site-packages in the first place (with sudo pip install pexpect or apt-get install python-pexpect or whatever; the same way you installed pxssh ). If not, you have to do that, too.