AttributeError: 'module' object has no attribute 'sendline'

Question

#!/usr/bin/python2.6 
# -*- coding: utf-8 -*-
# filename: pexpect_test.py

import pexpect,time,sys
def sendCommt():
    demo = open("result.txt", "ab")
    demo.write('==========Log Tile: demo==========\n')
    print "start link"
    child = pexpect.spawn('ssh %s@%s' % (user,ip))
    print "link to 10.10.16.24."
    child.expect("natsu@10.10.16.24's password: ")
    child.sendline(passwd)
    for cmd in cmds:
        time.sleep(2)
        p = pexpect.spawn(cmd)
        p.logfile = demo
        p.write('=====================\n')
        p.expect(pexpect.EOF)
        print cmd
    time.sleep(2)
    demo.close()
    child.close()
    print "done"

if __name__ == '__main__':
    user = 'natsu'
    ip = '10.10.16.24'
    passwd = '1'
    cmds = ['ps','ls','ls -l','ifconfig','date']
    # patterns = ['Are you sure you want to continue connecting (yes/no)?','password:']
    # CONTINUES,PASSWD = range(len(patterns))
    # flag = 'yes'
    try:
        sendCommt()
    except pexpect.TIMEOUT:  
        print "TIMEOUT" 
    # except pexpect.EOF:
    #     print "EOF"

在linux环境下运行Python
上面的代码可以运行通过
但是把p = pexpect.spawn(cmd) 改成 p = pexpect.sendline(cmd)后，就会报这个错误

这里有个类似的描述http://stackoverflow.com/questions/11403932/python-attributeerror-module-object-has-no-attribute-serial
但是照他的改法会报这个

Answer 1

看下面dir的结果，pexpect模块里面没有sendline这个方法，所以会报AttributeError.

>>> import pexpect
>>> dir(pexpect)
['EOF', 'ExceptionPexpect', 'Expecter', 'PY3', 'TIMEOUT', '__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', '__revision__', '__version__', 'exceptions', 'expect', 'is_executable_file', 'pty_spawn', 'run', 'runu', 'searcher_re', 'searcher_string', 'spawn', 'spawnbase', 'spawnu', 'split_command_line', 'sys', 'utils', 'which']

正确的用法示例如下：

# This connects to the openbsd ftp site and
# downloads the recursive directory listing.
import pexpect
child = pexpect.spawn('ftp ftp.openbsd.org')
child.expect('Name .*: ')
child.sendline('anonymous')
child.expect('Password:')
child.sendline('[e-mail]')
child.expect('ftp> ')
child.sendline('lcd /tmp')
child.expect('ftp> ')
child.sendline('cd pub/OpenBSD')
child.expect('ftp> ')
child.sendline('get README')
child.expect('ftp> ')
child.sendline('bye')

要在pexpect.spawn(cmd)的返回值上调用sendline方法，参考：http://pexpect.readthedocs.org/en/stable/overview.html

Answer 2

Pexpect on Windows
New in version 4.0: Windows support

Pexpect can be used on Windows to wait for a pattern to be produced by a child process, using pexpect.popen_spawn.PopenSpawn, or a file descriptor, using pexpect.fdpexpect.fdspawn. This should be considered experimental for now.

pexpect.spawn and pexpect.run() are not available on Windows, as they rely on Unix pseudoterminals (ptys). Cross platform code must not use these.