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Python 101: Interactively learn how to program with Python 3

Creating a Simple Logger

Explore how to create a simple logger in Python using the logging module. Understand logging levels, configuration options, and how to log messages and exceptions. This lesson helps you write logs to files or console and manage multiple loggers for clearer debugging and error tracking.

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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, ...

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 ...