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 logging
LOG_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.py

Output:
FILE:
DEBUG:root:This message should go to the log file

Check hello.py and you see the debug message...