Example of configuring logging in Python:
import logging
# Create logger and set the level (and higher) we are logging
logger = logging.getLogger("MyProgram")
logger.setLevel(logging.INFO)
# Levels: DEBUG, INFO, WARNING, ERROR, CRITICAL
# INFO = log messages of level INFO and higher
# Set the output format to use
formatter = logging.Formatter("%(asctime)s %(name)s %(levelname)s: %(message)s")
# Enable logging to console
console_logging = logging.StreamHandler()
console_logging.setFormatter(formatter)
logger.addHandler(console_logging)
# Enable logging to a file
file_logging = logging.FileHandler("logtest.log")
file_logging.setFormatter(formatter)
logger.addHandler(file_logging)
# Now test the logging:
logger.info("First message to be logged")
# This does not log anything yet:
logger.debug("Low-level status information here")
# Adjust the logging level and retry debug logging:
logger.setLevel(logging.DEBUG)
logger.debug("Low-level status information finally here")Output:
$ python3 logtest.py
2019-04-14 20:05:31,493 MyProgram INFO: First message to be logged
2019-04-14 20:05:31,493 MyProgram DEBUG: Low-level status information finally here
$ cat logtest.log
2019-04-14 20:05:31,493 MyProgram INFO: First message to be logged
2019-04-14 20:05:31,493 MyProgram DEBUG: Low-level status information finally here
More information: https://docs.python.org/3/library/logging.html