问题描述：

当使用spellpy对日志文件进行解析时，出现如下错误：
执行的代码为：

for log_name in ['openstack_abnormal.log', 'openstack_normal2.log', 'openstack_normal1.log']:
	parser.parse(log_name)
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错误信息为：

Traceback (most recent call last):
  File "preprocess.py", line 62, in <module>
    parser.parse(log_name)
  File "D:\Anaconda\lib\site-packages\spellpy\spell.py", line 188, in parse
    self.load_data()
  File "D:\Anaconda\lib\site-packages\spellpy\spell.py", line 300, in load_data
    self.df_log = self.log_to_dataframe(os.path.join(self.path, self.logname), regex, headers, self.logformat)
  File "D:\Anaconda\lib\site-packages\spellpy\spell.py", line 316, in log_to_dataframe
    signal.signal(signal.SIGALRM, self._log_to_dataframe_handler)
AttributeError: module 'signal' has no attribute 'SIGALRM'
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问题分析

spell调用了signal模块，该模块可以在linux下正常使用，但在windows下却有一些限制：
“On Windows, signal() can only be called with SIGABRT, SIGFPE, SIGILL, SIGINT, SIGSEGV, or SIGTERM. A ValueError will be raised in any other case.”

在Windows环境下只有这个几个信号类型允许被使用：

• SIGABRT
• SIGFPE
• SIGILL
• SIGINT
• SIGSEGV
• SIGTERM