rainbowlog 2.0.5

Format your python logs with colours based on the log levels.

Rainbow Log

Format your python logs with colours based on the log levels.

Installation

You can instll the package with pip.

$ pip install rainbowlog

$ conda install rainbowlog -c abrahammurciano

Links

• Documentation
• Github
• PyPI

Usage

Here's a basic example of a script that logs colorfully to the console, but regularly to a file.

import logging
import rainbowlog

logger = logging.getLogger(__name__)

# This one will write to the console
stream_handler = logging.StreamHandler()

# This one will write to a file
file_handler = logging.FileHandler("output.log")

# Here we decide how we want the logs to look like
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")

# We want the stream handler to be colorful
stream_handler.setFormatter(rainbowlog.Formatter(formatter))

# We don't want the file handler to be colorful
file_handler.setFormatter(formatter)

# Finally we add the handlers to the logger
logger.addHandler(stream_handler)
logger.addHandler(file_handler)

if __name__ == "__main__":
	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")
	logger.critical("This is a critical message")

If you want to change the format of the logs for each log level, you can use any callable that takes a string and returns the same string with ANSI codes surrounding it. There are many libraries you can use to provide such callables.

import logging
from rainbowlog import Formatter

# Here are some libraries you can use to get a style callable without dealing with ANSI codes
from constyle import Style, Attributes as Attrs
import termcolor
from functools import partial


formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
color_formatter = Formatter(
	formatter,
	log_styles={
		logging.DEBUG: Style(Attrs.BLUE, Attrs.FAINT), # An example using constyle
		logging.INFO: lambda s: f"\033[32m{s}\033[0m", # An example using lambdas
		logging.WARNING: termcolor.red, # An example using termcolor's predifined functions
		logging.ERROR: partial(termcolor.colored, color="red", on_color="on_white", attrs=["bold"]), # An example using functools.partial
		logging.CRITICAL: Attrs.RED + Attrs.ON_YELLOW + Attrs.BOLD + Attrs.UNDERLINE, # An example using constyle's added attributes
	}
	exception_style=lambda s: f"{Attrs.RED + Attrs.ON_WHITE + Attrs.BOLD}{s}{Attrs.RESET}" # An example using lambdas and constyle,
	stack_style=Attrs.RED, # An example using a single constyle attribute
)