在pexpect中创建交互式选项 [英] Creating interactive options in pexpect

问题描述

这是一个笨拙的问题，因为我无法找到描述它的好方法，但是期望您可以执行以下操作:

This is sort of a clunky question as I can't figure out a good way to describe it, but in expect you can do something like this:

interact {
    \001 {do_something}
    \003 {do_something_else}
    "?" {
      set timeout 1
      expect_user {
                   "?" {send "?"}
                   timeout {send_user "show a menu of the things you can do"}
      }
      stty raw -echo
      set timeout 60
    }
    \035 {send "^]"
      send "quit\r"
      send_user "\n"
      exit
    }
  }

会创建一个交互式会话，使用户可以照常进行交易，但是在按下键盘组合键( ctrl + a ， ctrl + c ， ctrl + e 、?等)执行操作或显示描述可能的快捷方式的文本.

which would create an interactive session where the user could go about business as usual, but upon pressing keyboard combos (ctrl+a, ctrl+c, ctrl+e, ?, etc) execute actions or display text describing the possible shortcuts.

我正在尝试将许多脚本更新为python& pexpect，但无法确定pexpect是否可行.我尝试使用输入过滤器进行推算，但看来这并不是真正的正确"选择，或者也许我似乎无法在行动中找到任何好的例子.

I'm trying to update a number of scripts to python & pexpect but haven't been able to figure out if this is possible in pexpect. I tried putzing around with an input filter but it seems this isn't really the 'right' place to do it, or maybe I just can't seem to find any good examples of it in action.

@pynexj:尝试了您的脚本，尽管我没有从ctrl命令的stdout上得到任何东西.

@pynexj: tried your script, though I'm not getting anything on stdout from the ctrl commands.

16:51:16 ~/scripts $ p3 testInputFilter.py | tee testInput.txt
16:51:19 ~/scripts $ ps u
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
usr 45721  0.0  0.0 109620  1876 pts/1    Ss   16:49   0:00 -ksh
usr 46622  0.0  0.0 108436  1776 pts/1    S    16:51   0:00 bash
usr 46734  5.5  0.0 135728  7688 pts/1    S+   16:51   0:00 python3.6 testI
usr 46735  0.0  0.0 100912   632 pts/1    S+   16:51   0:00 tee testInput.t
usr 46736  0.0  0.0 108336  1692 pts/5    Ss   16:51   0:00 /bin/bash --nor
usr 46759  0.0  0.0 110236  1132 pts/5    R+   16:51   0:00 ps u
16:51:21 ~/scripts $ ^C
16:51:42 ~/scripts $ exit
16:51:43 ~/scripts $ cat testInput.txt
16:51:19 ~/scripts $ ps u
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
usr 45721  0.0  0.0 109620  1876 pts/1    Ss   16:49   0:00 -ksh
usr 46622  0.0  0.0 108436  1776 pts/1    S    16:51   0:00 bash
usr 46734  5.5  0.0 135728  7688 pts/1    S+   16:51   0:00 python3.6 testI
usr 46735  0.0  0.0 100912   632 pts/1    S+   16:51   0:00 tee testInput.t
usr 46736  0.0  0.0 108336  1692 pts/5    Ss   16:51   0:00 /bin/bash --nor
usr 46759  0.0  0.0 110236  1132 pts/5    R+   16:51   0:00 ps u
16:51:21 ~/scripts $ ^C
16:51:42 ~/scripts $ exit
16:51:57 ~/scripts $

推荐答案

请参见以下示例(适用于 Python2 和 Python3 ):

See following example (works for both Python2 and Python3):

[STEP 114] # cat foo.py
import pexpect

def input_filter(s):
    if s == b'\x03':
        return b'\r: r u going to kill me? press ctrl-d to exit!\r'
    elif s == b'\x04':
        return b'\r: ok, bye; exit\r'
    else:
        return s

proc = pexpect.spawn('bash --norc')
proc.interact(input_filter=input_filter)
proc.expect(pexpect.EOF)
[STEP 115] # python foo.py
bash-4.4# ps                      <-- user input
   PID TTY          TIME CMD
 77616 pts/56   00:00:00 bash
 77617 pts/56   00:00:00 ps
bash-4.4#                         <-- press CTRL-C
bash-4.4# : r u going to kill me? press ctrl-d to exit!
bash-4.4#                         <-- press CTRL-D
bash-4.4# : ok, bye; exit
exit
[STEP 116] #

这篇关于在pexpect中创建交互式选项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！