sharklog

Python logging helper.

Quick Start

• Install sharklog:

python -m pip install sharklog

• Use in standalone script:

# standalone.py
from sharklog import logging

logging.init(debug=True)    # init current logger with level=logging.DEBUG
# or logging.init(level=logging.DEBUG)
logging.debug("debug message")
logging.info("info message")
logging.warning("warning message")
logging.error("error message")

If you want to change logging level for a module, you can set it in the module by:

from sharklog import logging
logging.getLogger().setLevel(logging.DEBUG)

or set it outside the module by specifying the logger name:

from sharklog import logging
logging.getLogger("module_name").setLevel(logging.DEBUG)

The default format of log messages is:

"[%(levelname)s]: %(message)s [%(asctime)s](%(filename)s:%(lineno)d)"

Usage in Package Development

Now I assume your file structure is like this:

--- parent_package
    |--- __init__.py
    |--- parent_module.py
    |--- logger.py
    |--- sub_package
        |--- __init__.py
        |--- sub_module.py

• First, you can add NullHandler to the root logger in parent_package/__init__.py, which logger named parent_package:

# parent/__init__.py
from sharklog import logging

logging.getLogger().addHandler(logging.NullHandler())

This is mentioned in the Python Logging HOWTO to identify the logger's default behavior.

• Then, use logging in your package, they will be prefixed with the logger name parent_package.:

# parent_module.py which is placed under package `parent_package`
from sharklog import logging

logger = logging.getLogger()    # the logger name will be `parent_package.parent_module`

logger.debug("debug message")
logger.info("info message")
logger.warning("warning message")
logger.error("error message")

If you already using builtin logging module, you can use sharklog as a drop-in replacement.

Just change import logging into from sharklog import logging. Then you can use logging as usual:

# sub_module.py
from sharklog import logging

# these log messages will be prefixed with the logger name `xxxpackage.xxmodule.module_name`
# here, as an example, the logger name will be `parent_package.sub_package.sub_module`
logging.debug("debug message")
logging.info("info message")
logging.warning("warning message")
logging.error("error message")

• Finally, you can set the logging level for the package in the main script which using the package:

# main.py
from sharklog import logging

from parent_package import parent_module
from parent_package.sub_package import sub_module

if __name__ == "__main__":
    logging.init(debug=True)    # init current logger with level=logging.DEBUG
    # or logging.init(level=logging.DEBUG)
    # logging inside the package will use the level set here

Or if you want to change the logging level for a specific module, you can set it in the module by:

from sharklog import logging
logging.getLogger().setLevel(logging.WARNING)