How to log to file and console simultaneously in Python
To log to both a file and the console simultaneously in Python, you need to set up two handlers for the logger: one for writing logs to a file and another for printing logs to the console. The
logging module in Python makes it straightforward to achieve this. Here's an example of how to log to both file and console:
import logging # Create a logger logger = logging.getLogger('my_logger') logger.setLevel(logging.DEBUG) # Create a formatter to define the log format formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s') # Create a file handler to write logs to a file file_handler = logging.FileHandler('app.log') file_handler.setLevel(logging.DEBUG) file_handler.setFormatter(formatter) # Create a stream handler to print logs to the console console_handler = logging.StreamHandler() console_handler.setLevel(logging.INFO) # You can set the desired log level for console output console_handler.setFormatter(formatter) # Add the handlers to the logger logger.addHandler(file_handler) logger.addHandler(console_handler) # Now you can log messages with different levels logger.debug('This is a debug message') logger.info('This is an info message') logger.warning('This is a warning message') logger.error('This is an error message')
In this example, we create two handlers,
console_handler, with different log levels. The
file_handler is set to log all messages with level DEBUG and above to the file "app.log." The
console_handler is set to log messages with level INFO and above to the console. You can adjust the log levels and formats according to your preferences.
With this setup, logs of the specified severity levels will be written to both the file "app.log" and the console simultaneously.
To learn more about logging in Python, visit Better Stack Community.
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