Log formatting with colors!
Project description
ColoredFormatter is a formatter for use with pythons logging module.
It allows colors to be placed in the format string, which is mostly useful when paired with a StreamHandler that is outputting to a terminal. This is accomplished by added a set of terminal color codes to the record before it is used to format the string.
Codes
The following values are made availible for use in the format string:
fg_{colorname}, bg_{colorname}: Foreground and background colors. The colors names are black, red, green, yellow, blue, purple, cyan and white.
bold: Bold output.
reset: Clear all formatting (both foreground and background colors).
log_color: Return the color associated with the records level (from color_levels).
Arguments
ColoredFormatter takes several arguments:
format: The format string used to output the message (required).
datefmt: An optional date format passed to the base class. See logging.Formatter.
reset: Implicitly adds a color reset code to the message output, unless the output already ends with one. Defaults to True.
log_colors: A mapping of record level names to color names. The defaults can be found in colorlog.default_log_colors, or the below example.
style: Availible on Python 3.2 and above. See logging.Formatter.
Examples
The following code creates a ColoredFormatter for use in a logging setup, passing each arguments defaults to the constructor:
from colorlog import ColoredFormatter
formatter = ColoredFormatter(
"%(log_color)s%(levelname)-8s%(reset)s %(blue)s%(message)s",
datefmt=None,
reset=True,
color_levels={
'DEBUG': 'cyan',
'INFO': 'green',
'WARNING': 'yellow',
'ERROR': 'red',
'CRITICAL': 'red',
}
)
With dictConfig
logging.config.dictConfig({
'formatters': {
'colored': {
'()': 'colorlog.ColoredFormatter',
'format': "%(log_color)s%(levelname)-8s%(reset)s %(blue)s%(message)s"
}
},
...
})
A full example dictionary can be found in tests/test_colorlog.py.
With fileConfig
... [formatters] keys=color [formatter_color] class=colorlog.ColoredFormatter format=%(log_color)s%(levelname)-8s%(reset)s %(bg_blue)s[%(name)s]%(reset)s %(message)s from fileConfig datefmt=%m-%d %H:%M:%S ...
An instance of ColoredFormatter created with those arguments will then be used by any handlers that are configured to use the color formatter.
A full example configuration can be found in tests/test_config.ini.
Compatibility
colorlog works on Python 2.6 and above, including Python 3.
Tests
Tests similar to those in the above examples can be found in tests/test_colorlog.py. The tests can be run with:
python2.6 tests/test_colorlog_26.py python2.7 tests/test_colorlog.py python3.2 tests/test_colorlog.py
Licence
colorlog is distributed under the MIT Licence.
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