Simple File Logger

This python package provides a Logger class which is easy to use for basic logging to files.

Install

pip install simple-file-logger

Usage

from simple_file_logger import Logger

logger = Logger("my_log_file", "path/to/log/directory")
logger.info("Hello!")

# writes to `my_log_file_YYYYMMDD_HHMM_SS.log`
# 2022-01-26 11:57:14,182 - INFO - Hello!

The constructor provides various options to configure the logger.

logfile_name: str,
log_dir: Union[Path, str, None]=None,
level=logging.DEBUG,
mode="w",
add_timestamp_to_filename=True,
log_to_console=False,
is_null_handler=False,
is_rolling_handler=False,
process: str = None,

• To disable to console in addition to the file (default behavior), pass log_to_console=False.

• The is_rolling_handler parameter controls whether the logger automatically writes to a new file when the existing one becomes larger than 5mb. It will archive the current log with a serial number and transition to a new file automatically. The limit of archived files is 5 so the oldest one will get deleted when archiving for the 6th time.

• The is_null_handler parameter initializes a logger that does nothing. This is useful for unit testing libraries where functions log messages but you don't want any actual logging to take place.

• The process parameter is a little addition to provide some info about what process the currently running script represents. It can be any arbitrary string, such as downloading_data or monitoring_files etc. This process will also appear on each log line. As the script executes, you can set the process in the logger object to a new value. This is helpful for producing files which facilitate easy line extraction related to a specific process when the file is big.

  logger.process = "downloading_file"
  # ... logic to download some file which does some logging.
  # The lines will have `downloading_file` before the log message.
  
  # update file contents
  logger.process = "update_contents"  # set process to indicate the context of log messages to follow
  
  # ... logic to update file contents and do some logging.
  
  # no need for further process logs, and just want to log messages.
  logger.process = ""  # prevents addition of process string to log message.