Python-从日志文件打印错误文本

Question

我有一个日志文件（下面的示例），用于跟踪错误，警告和信息。我想在Python中创建一个仅提取错误的脚本。我想提取带有时间戳的标题和带有错误文本的行。

>>> Log file (e.g. logfile.log)
=====
2018-10-31 05:20:57.282  WARN
2018-10-31 05:20:57.331  WARN
2018-10-31 05:20:57.367  INFO
2018-10-31 05:20:57.367 ERROR
text
text
text
2018-10-31 05:20:57.367 INFO

>>> Expected results:
2018-10-31 05:20:57.367 ERROR
text
text
text

非常感谢您的帮助。

Answer 1

file_in = open('logfile.log','r') # Read file
for line in file_in: # Loop every line
    if 'ERROR' in line: # Search for ERROR in line
        print(line) # Print line
    elif 'INFO' not in line and 'WARN' not in line: # Remove INFO and WARN lines
        print(line) # Print line