無法通過python記錄器打印pexpect響應

Question

我試圖通過我已經定義的記錄器獲得pexepct stdout日志。 下面是代碼

import logging
import pexpect
import re
import time
# this will be the method called by the pexpect object to log
def _write(*args, **kwargs):
    content = args[0]
    # let's ignore other params, pexpect only use one arg AFAIK
    if content in [' ', '', '\n', '\r', '\r\n']:
        return # don't log empty lines
    for eol in ['\r\n', '\r', '\n']:
        # remove ending EOL, the logger will add it anyway
        content = re.sub('\%s$' % eol, '', content)
    return logger.info(content) # call the logger info method with the 
#reworked content
# our flush method
def _doNothing():
    pass
# get the logger
logger = logging.getLogger('foo')
# configure the logger
logger.handlers=[]
logger.addHandler(logging.StreamHandler())
logger.handlers[-1].setFormatter(logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s"))
logger.setLevel(logging.INFO)
# give the logger the methods required by pexpect
logger.write = _write
logger.flush = _doNothing
logger.info("Hello before pexpect")
p = pexpect.spawn('telnet someIP')
p.logfile=logger
time.sleep(3)
p.sendline('ls')
logger.info("After pexpect")

使用上面的代碼，logger正在打印pexepct在控制台上發送命令但我沒有得到pexpect的響應。 有沒有辦法我可以通過記錄器記錄pexpect響應

以下是輸出

2018-06-15 13:22:49,610 - foo - INFO - Hello before pexpect
2018-06-15 13:22:52,668 - foo - INFO - ls

等待答復

Answer 1

在您閱讀或期望之前，不會打印文本。 當你使用預期時，你會得到p.after和p.before填充

p.sendline('ls')
logger.info("After pexpect")
p.read()

另見下面的線程

如何在pexpect中看到輸出？

如何發送單個ssh命令來獲取帶有pexpect的結果字符串？

Answer 2

如果您只想輸出pexpect的所有顯示消息，請嘗試以下操作：

LOG_FILE = open("logfile.log", "w+")
p = pexpect.spawn('telnet someIP')
p.logfile = LOG_FILE
p.sendline('ls')

然后，您將看到LOG_FILE中的所有內容