livelog

livelog is yet another Python logger.

Its main purpose is to provide live logging for situation where logging to console is not possible. For example working on a GUI, TUI, a software plugin or a script instanciated from a different shell.

It provides a Logger object for your code and a built-in reader to see your logs in real time from another shell. Even if its overall behavior is opinionated it does offer some customization.

Demo

Installation

python3 -m pip install livelog

Logging

Basics

In your code, create a Logger instance with:

from livelog import Logger

logger = Logger()

Parameters

Logger takes multiple optional arguments:

• file (str): Path for your logging file. Default is a file named "livelog.log" in your system tmp directory.
• level (str): Minimum level to be logged. Default is "DEBUG", you can also select "INFO", "WARNING", and "ERROR". Note that level filtering can also be done directly from the reader.
• enabled (bool): Whether logging is enabled or not. Default is True.
• erase (bool): Whether preexisting logging file should be erased or not. Default is True.

from livelog import Logger

logger = Logger(file= "/home/user/",
                level = "INFO",
                enabled = False,
                erase = False)

Methods

Use the following methods to write log messages:

• logger.debug("message")
• logger.info("message")
• logger.warn("message")
• logger.error("message")

from livelog import Logger

logger = Logger()
logger.debug("This is a debug message")
logger.info("This is an info message")
logger.warn("This is a warning message")
logger.error("This is an error message")

Attributes

You can get and set attributes after instantiation:

from livelog import Logger

logger = Logger(file="/tmp/file.log")
logger.debug("This will write to /tmp/file.log")

logger.file = "/tmp/another_file.log"
logger.debug("This will write to /tmp/another_file.log")

logger.level = "ERROR"
logger.debug("This debug message will not be written.")

logger.enabled = False
logger.error("Logging disabled. This error message will not be written.")

Singleton

livelog also provides a built-in singleton:

your_first_file.py

from livelog import LoggerSingleton


logger = LoggerSingleton(file="/tmp/file.log")
logger.debug("This will write to /tmp/file.log")

another_file.py

from livelog import LoggerSingleton


logger = LoggerSingleton()
# LoggerSingleton() returned the instance from your first file.
logger.debug("This will write to /tmp/file.log")

Reading

Although you can access to your logging file like any other, you can use the provided reader.

If you did not specify a file for Logger simply use:

python3 -m livelog

livelog will read in real time the default log file.

Options

• -f or --file - Set the path of your logging file
• -l or --level - Set the minimum log level to be read.
• --nocolors - Do not print colors

Example:

python3 -m livelog -f /tmp/myfile.log -l INFO --nocolors