Skip to main content

Robust and effective logging for Python 2 and 3

Project description

logzero

Build status for master branch Documentation Status Latest version on PyPi Anaconda-Server Badge Downloads

Robust and effective logging for Python 2 and 3.

Logo

Features

  • Easy logging to console and/or (rotating) file.
  • Provides a fully configured standard Python logger object.
  • JSON logging (with integrated python-json-logger)
  • Pretty formatting, including level-specific colors in the console.
  • No dependencies
  • Windows color output supported by colorama
  • Robust against str/bytes encoding problems, works with all kinds of character encodings and special characters.
  • Multiple loggers can write to the same logfile (also across multiple Python files and processes).
  • Global default logger with logzero.logger and custom loggers with logzero.setup_logger(..).
  • Compatible with Python 2 and 3.
  • All contained in a single file.
  • Licensed under the MIT license.
  • Heavily inspired by the Tornado web framework.

Installation:

python -m pip install logzero

Example Usage

from logzero import logger

logger.debug("hello")
logger.info("info")
logger.warning("warn")
logger.error("error")

# This is how you'd log an exception
try:
    raise Exception("this is a demo exception")
except Exception as e:
    logger.exception(e)

# JSON logging
import logzero
logzero.json()

logger.info("JSON test")

# Start writing into a logfile
logzero.logfile("/tmp/logzero-demo.log")

# Set a minimum loglevel
logzero.loglevel(logzero.WARNING)

This is the output:

demo-output

Note: You can find more examples in the documentation: https://logzero.readthedocs.io

JSON logging

JSON logging can be enabled for the default logger with logzero.json(), or with setup_logger(json=True) for custom loggers:

>>> logzero.json()
>>> logger.info("test")
{"asctime": "2020-10-21 10:42:45,808", "filename": "<stdin>", "funcName": "<module>", "levelname": "INFO", "levelno": 20, "lineno": 1, "module": "<stdin>", "message": "test", "name": "logzero_default", "pathname": "<stdin>", "process": 76179, "processName": "MainProcess", "threadName": "MainThread"}

>>> my_logger = setup_logger(json=True)
>>> my_logger.info("test")
{"asctime": "2020-10-21 10:42:45,808", "filename": "<stdin>", "funcName": "<module>", "levelname": "INFO", "levelno": 20, "lineno": 1, "module": "<stdin>", "message": "test", "name": "logzero_default", "pathname": "<stdin>", "process": 76179, "processName": "MainProcess", "threadName": "MainThread"}

The logged JSON object has these fields:

{
  "asctime": "2020-10-21 10:43:40,765",
  "filename": "test.py",
  "funcName": "test_this",
  "levelname": "INFO",
  "levelno": 20,
  "lineno": 9,
  "module": "test",
  "message": "info",
  "name": "logzero",
  "pathname": "_tests/test.py",
  "process": 76204,
  "processName": "MainProcess",
  "threadName": "MainThread"
}

Exceptions logged with logger.exception(e) have these additional JSON fields:

{
  "levelname": "ERROR",
  "levelno": 40,
  "message": "this is a demo exception",
  "exc_info": "Traceback (most recent call last):\n  File \"_tests/test.py\", line 15, in test_this\n    raise Exception(\"this is a demo exception\")\nException: this is a demo exception"
}

Take a look at the documentation for more information and examples:

Installation

Install logzero with pip:

python -m pip install logzero

Here's how you setup a virtualenv and download and run the demo:

# Create and activate a virtualenv in ./venv/
python3 -m venv venv
. venv/bin/activate

# Install logzero
python -m pip install logzero

# Download and run demo.py
wget https://raw.githubusercontent.com/metachris/logzero/master/examples/demo.py
python demo.py

If you don't have pip installed, this Python installation guide can guide you through the process.

Alternatively, if you use the Anaconda distribution:

$ conda config --add channels conda-forge
$ conda install logzero

You can also install logzero from the public Github repo:

$ git clone https://github.com/metachris/logzero.git
$ cd logzero
$ python setup.py install

Contributors


Development

Getting started

$ git clone https://github.com/metachris/logzero.git
$ cd logzero

# Activate virtualenv
$ python3 -m venv venv
$ . venv/bin/activate

# Install main and dev dependencies
$ pip install -e .
$ pip install -r requirements_dev.txt

# Run the tests
$ make test

# Run the linter
$ make lint

# Generate the docs (will auto-open in Chrome)
$ make docs

# You can enable watching mode to automatically rebuild on changes:
$ make servedocs

To test with Python 2.7, you can use Docker:

docker run --rm -it -v /Users/chris/stream/logzero:/mnt python:2.7 /bin/bash

Now you have a shell with the current directory mounted into /mnt/ inside the container.

Notes


Changelog

See the changelog here: https://github.com/metachris/logzero/blob/master/HISTORY.md

Feedback

All kinds of feedback and contributions are welcome.

logo

History

1.6.5 (2021-03-17)

  • Export loglevels directly (you can use eg. logzero.DEBUG instead of logging.DEBUG)
  • setup_default_logger use backupCount
  • Update dependencies
  • PRs: (386)[https://github.com/metachris/logzero/pull/386]

1.6.3 (2020-11-15)

  • JSON logging with UTF-8 enabled by default (PR 357)

1.6.0 (1.6.2) (2020-10-29)

  • JSON logging support (PR 344)
  • Ability to easily change colors (#82)
  • Allow creating a root logger (#342)
  • Bugfix: file logging with lower loglevel than stream (PR 338)
  • Running tests with Python up to 3.9
  • Dependency updates

1.5.0 (2018-03-07)

  • logzero.syslog(..) (PR 83)

1.4.0 (2018-03-02)

  • Allow Disabling stderr Output (PR 83)

1.3.0 (2017-07-19)

  • Color output now works in Windows (supported by colorama)

1.2.1 (2017-07-09)

  • Logfiles with custom loglevels (eg. stream handler with DEBUG and file handler with ERROR).

1.2.0 (2017-07-05)

  • Way better API for configuring the default logger with logzero.loglevel(..), logzero.logfile(..), etc.
  • Built-in rotating logfile support.
import logging
import logzero
from logzero import logger

# This log message goes to the console
logger.debug("hello")

# Set a minimum log level
logzero.loglevel(logging.INFO)

# Set a logfile (all future log messages are also saved there)
logzero.logfile("/tmp/logfile.log")

# Set a rotating logfile (replaces the previous logfile handler)
logzero.logfile("/tmp/rotating-logfile.log", maxBytes=1000000, backupCount=3)

# Disable logging to a file
logzero.logfile(None)

# Set a custom formatter
formatter = logging.Formatter('%(name)s - %(asctime)-15s - %(levelname)s: %(message)s');
logzero.formatter(formatter)

# Log some variables
logger.info("var1: %s, var2: %s", var1, var2)

1.1.2 (2017-07-04)

  • Better reconfiguration of handlers, doesn't remove custom handlers anymore

1.1.0 (2017-07-03)

  • Bugfix: Disabled color logging to logfile

1.1.0 (2017-07-02)

  • Global default logger instance (logzero.logger)
  • Ability to reconfigure the default logger with (logzero.setup_default_logger(..))
  • More tests
  • More documentation

1.0.0 (2017-06-27)

  • Cleanup and documentation

0.2.0 (2017-06-12)

  • Working logzero package with code and tests

0.1.0 (2017-06-12)

  • First release on PyPI.

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

logzero-1.7.0.tar.gz (577.8 kB view hashes)

Uploaded Source

Built Distribution

logzero-1.7.0-py2.py3-none-any.whl (16.2 kB view hashes)

Uploaded Python 2 Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page