Mastering Python Scripting for System Administrators

Adding logging and warning code to scripts

In this section, we will learn about the logging and warnings modules of Python. The logging module will keep a track of events occurring within a program. The warnings module warns the programmers about the changes made in the language as well as the libraries.

Now, we are going to see a simple logging example. We will write a script called logging_example.py and write the following code in it:

import loggingLOG_FILENAME = 'log.txt'logging.basicConfig(filename=LOG_FILENAME, level=logging.DEBUG,)logging.debug('This message should go to the log file')with open(LOG_FILENAME, 'rt') as f:            prg = f.read()print('FILE:')print(prg)

Run the program as follows::

$ python3 logging_example.pyOutput:FILE:DEBUG:root:This ...