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Adding Logging to a Python Application

Logging is a powerful tool. It can be used for many different functions. For example, it can used in a legal situation as evidence for who has done what while using the application. It can be used to rebuild a database if the database is destroyed without a viable backup. It can also help a developer track down elusive errors when an application has gone to production. You will need basic Python programming and SQL skills for this lab: - [Certified Associate in Python Programming Certification](https://linuxacademy.com/cp/modules/view/id/470)

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Path Info

Level
Clock icon Beginner
Duration
Clock icon 1h 0m
Published
Clock icon Jun 05, 2020

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Table of Contents

  1. Challenge

    Add Logging to tally.py

    You should add logging to tally.py. Create a separate log file for each item. The file should be named <item-number>.log. The log level should be info and each log message should be date:level:message. Finally, log the final tally message.

    tally.py:

    import logging
    
    def tally_votes(data):
        """
        the example voting data and operations are in the __main__ section
        write code that will ask for user input for item number being voted on
        create a log file named <voting item>.log
        tally votes and log each vote
        using: tally = f"Item: {voting_item} Yes: {yes} No: {no}"
        return tally
        """
        voting_item = input("What is the item number for this vote? ").strip()
        file_name = f"{voting_item}.log"
    
        logging.basicConfig(
            filename=file_name,
            format='%(asctime)s:%(levelname)s:%(message)s', level=logging.INFO)
    
        yes = 0
        no = 0
        for vote in data:
            if vote == 'y':
                yes += 1
            else:
                no += 1
            # log vote
            logging.info(vote)
    
        tally = f"Item: {voting_item} Yes: {yes} No: {no}"
    
        logging.info(tally)
    
        return tally
    
    if __name__ == "__main__":
        voting_data = ["y", "n", "y", "y", "y", "n"]
        tally = tally_votes(voting_data)
        print(tally)
    
  2. Challenge

    Review the Log File

    Review the log file using cat <logfile> (replacing <logfile> with whatever the file is called).

    Congratulations! You have shown that you can do basic logging.

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