如何从pxssh模块使用'sync_original_prompt'

Question

>>> from pexpect import pxssh
>>> s=pxssh.pxssh()
>>> s.login('IP','USER','PASSWORD',auto_prompt_reset=True)
True
>>> s.sendline('echo Test');
10
>>> s.prompt()
True
>>> s.after
'[PEXPECT]# '
>>> s.PROMPT='BTEQ -- Enter your SQL request or BTEQ command:'
>>> s.sendline('bteq .logon dbc,dbc')
20
>>> s.prompt()
True
>>> s.after
'BTEQ -- Enter your SQL request or BTEQ command:'
>>> s.sendline('quit;')
6
>>> s.prompt()
False
>>> s.PROMPT='[PEXPECT]# '
>>> s.prompt()
False
>>> s.sync_original_prompt()
True
>>> s.prompt()
False

As per my understanding after s.sync_original_prompt() , PROMPT variable should reset to initial prompt, which is [PEXPECT]# here, and s.prompt() should result in True . But it doesn't. Can anybody please tell me how to reset PROMPT variable to original prompt? and how to use sync_original_prompt attribute?

Thanks.

Answer 1

• The initial s.PROMPT (a regexp string) is actually '\\\\[PEXPECT\\\\][\\\\$\\\\#] ' , not [PEXPECT]# . I'd suggest you write like this:

   savePrompt = s.PROMPT s.PROMPT = 'a-new-prompt' s.sendline('bteq ...') s.prompt() # expect the new prompt s.PROMPT = savePrompt # restore the saved prompt s.sendline('quit;') s.prompt() # expect the saved prompt 

• sync_original_prompt() should be used like this:

   s.sync_original_prompt() # this make sure you are at the prompt s.set_unique_prompt() # change the shell's prompt to the default PROMPT s.sendline('run some command') s.prompt()