![]() That’s great for local debugging, but you’ll often need to send logs to other destinations in practice. Thus far, we’ve emitted our log messages to the console. The output will look similar to the following: INFO:root:Keep going, you are doing great! Sending Python logs to different destinations The new code will look like this: # Import the default logging module If we want to log INFO-level messages, we can use basicConfig() and set level=logging.INFO. When we run our script, we notice that this message, as expected, doesn’t print to the console. For other loggers, NOTSET messages are delegated to parent loggers until a level other than NOTSET is found. Setting the root logger to NOTSET logs all messages. Messages useful for debugging how an application is running.ĭefault level when a new logger is created. Messages that log standard/expected events. Potentially negative events that may cause abnormal operation or otherwise require attention (such as the use of a deprecated API). ![]() High severity messages generally related to an operation failing that does not cause the program to crash or exit. Highest severity messages may cause a program to crash or exit. The table below describes each of the default logging levels. Each default severity is associated with a number, and a higher numeric value indicates a more severe logging level. ![]() There are six default severities with the default Python logging module. In short, log messages generally include a severity that indicates the importance of the message. If you’re familiar with the Syslog protocol, the idea of logging levels and log severity should be intuitive. When you run the script, the output should look similar to the following: 11:11:38,525 - HumioDemoLogger - INFO - Python logging is cool! Python logging levels # Create a message format that matches earlier exampleįormatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s') Logger = logging.getLogger('HumioDemoLogger') For example, the script below creates a HumioDemoLogger set to log INFO-level messages with the same formatting as our previous example. In that case, we can create our own logger by setting a logger = value and defining the settings of our logger (remember, basicConfig() is only for the root logger). What if we don’t want to use the root logger? The output should look similar to the following: 11:11:51,994 WARNING:root:You are learning Python logging! Logging.warning('You are learning Python logging!') Logging.basicConfig(format='%(asctime)s %(levelname)s:%(name)s:%(message)s') Our resulting code will look like this: # Import the default logging module To retain the rest of our original formatting, we’ll also need to include %(levelname)s:%(name)s:%(message)s. We can add %(asctime)s to a basicConfig() format call. We can call basicConfig() at the beginning of our code to customize formatting for the root logger.įor example, suppose we want to add a timestamp to our message. In many cases, we’ll want to modify how messages are formatted. In that example, we can see the default message format is as follows: :: Running that code will print this message to the console: WARNING:root:You are learning Python logging! Here’s a basic example that uses the default logger (also known as the root logger): To use the default logger, just add import logging to your Python program, and then create a log message.
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