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Python 101: Interactively learn how to program with Python 3

Creating a Simple Logger

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Creating a log with the logging module is easy and straight-forward. It’s easiest to just look at a piece of code and then explain it, so here’s some code for you to read:

Python 3.5
import logging
# add filemode="w" to overwrite
logging.basicConfig(filename="sample.log", level=logging.INFO)
logging.debug("This is a debug message")
logging.info("Informational message")
logging.error("An error has happened!")
# Let's use our file reading knowledge to 
# read the log file
with open("sample.log") as file_handler:
    for line in file_handler:
        print(line)

As you might expect, to access the logging module you have to first import it. The easiest way to create a log is to use the logging module’s basicConfig function and pass it some keyword arguments. It accepts the following: filename, filemode, ...