cutelog – GUI for logging

This is a graphical log viewer for Python's logging module. It can be targeted with a SocketHandler with no additional setup (see Usage).

It can also be used from other languages or logging libraries with little effort (see the Wiki). For example, a Go library gocutelog shows how to enable regular Go logging libraries to connect to cutelog.

Features

• Allows any number of simultaneous connections
• Customizable look of log levels and columns, with presets for each
• Filtering based on level and namespace, as well as filtering by searching
• Search through all records or only through filtered ones
• Display extra fields under the message with Extra mode
• View exception tracebacks or messages in a separate window
• Dark theme (with its own set of colors for levels)
• Pop tabs out of the window, merge records of multiple tabs into one
• Save/load records to/from a file in JSON format

Screenshots

Light theme	Dark theme

Installation

If you're using Linux, install PyQt5 (or PySide2) from your package manager before installing cutelog (package name is probably python3-pyqt5 or python-pyqt5). Or just run pip install pyqt5 to install it from pip, which is sub-optimal.

$ pip install cutelog

Or install the latest development version from the source (requires PyQt5 to build resources):

$ pip install git+https://github.com/busimus/cutelog.git

Requirements

• Python 3.5 (or newer)
• PyQt5 (preferably 5.6 or newer) or PySide2
• QtPy

Usage

1. Start cutelog
2. Put the following into your code:

import logging
from logging.handlers import SocketHandler

log = logging.getLogger('Root logger')
log.setLevel(1)  # to send all records to cutelog
socket_handler = SocketHandler('127.0.0.1', 19996)  # default listening address
log.addHandler(socket_handler)
log.info('Hello world!')

Afterwards it's recommended to designate different loggers for different parts of your program with log_2 = log.getChild("Child logger"). This will create "log namespaces" which allow you to filter out messages from various subsystems of your program.

Attributions

Free software used:

• Qt via either:
  • PyQt5 - GPLv3 License, Copyright (c) 2019 Riverbank Computing Limited info@riverbankcomputing.com
  • PySide2 - LGPLv3 License, Copyright (C) 2015 The Qt Company Ltd (http://www.qt.io/licensing/)
• QtPy - MIT License, Copyright (c) 2011- QtPy contributors and others
• jsonstream - MIT License, Copyright (c) 2020 Dunes
• ion-icons - MIT License, Copyright (c) 2015-present Ionic (http://ionic.io/)

And thanks to logview by Vinay Sajip for UI inspiration.

Copyright and license

This program is released under the MIT License (see LICENSE file).

Copyright © 2023 bus and contributors.