python pexpect安装

安装

https://pypi.python.org/pypi/pexpect 
下载pexpect 4.0.1 
放到ubuntu中解压 
tar -xzvf pexpect 4.0.1.tar.gz 
到达相应路径 
python ./setup.py install 
即可安装 
安装时候报了个错

File "/usr/local/lib/python2.7/dist-packages/pexpect/_async.py", line 19
    transport, pw = yield from asyncio.get_event_loop()\
                             ^
SyntaxError: invalid syntax

查了查没结果 
直接进入python环境import pexpect试试 
发现有问题

>>> import pexpect
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "pexpect/__init__.py", line 75, in <module>
    from .pty_spawn import spawn, spawnu
  File "pexpect/pty_spawn.py", line 11, in <module>
    import ptyprocess
ImportError: No module named ptyprocess

少了个模块， 
https://pypi.python.org/pypi/ptyprocess#downloads 
下了个ptyprocess 
一样解压，安装， 
之后import pexpect没问题，可以用了。