The main reason for including the previous section was to say—You should replace the print() functions with calls to logging functions in Python's logging module. Logging has several advantages over printing: it has a timestamp, a clearly marked level of urgency (for example, INFO, DEBUG), and you don't have to remove them from your code later.

Logging is fundamental to professional web development. Several applications in your production stack, like web servers and databases, already use logs. Debugging might take you to all these logs to retrace the events that lead to a bug. It is only appropriate that your application follows the same best practice and adopts logging for errors, warnings, and informational messages.

Unlike the common perception, using a logger does not involve too much work. Sure, the setup is slightly involved but it is merely a one-time effort for your entire project. Even more, most project templates (for example, the edge template) already do this for you.

Once...