How does one make logging color in Django/Google App Engine?

We use colorlog and it does exactly what you expect.

For posterity, the formatter config we use is:

'color': {
    '()': 'colorlog.ColoredFormatter',
    'format': '%(log_color)s%(levelname)-8s %(message)s',
    'log_colors': {
        'DEBUG':    'bold_black',
        'INFO':     'white',
        'WARNING':  'yellow',
        'ERROR':    'red',
        'CRITICAL': 'bold_red',
    },
}

Django already has support for color output through the 'DJANGO_COLORS' environment variable used for example when running the built in development server. Some person has noticed this and created a plug-and-play solution https://github.com/tiliv/django-colors-formatter; with that package on the project's python path my logging settings.py is as follow:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': True,
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse'
        }
    },
    'formatters': {
        'verbose': {
            '()': 'djangocolors_formatter.DjangoColorsFormatter', # colored output
            'format': '%(levelname)s %(name)s %(asctime)s %(module)s %(process)d %(thread)d %(pathname)s@%(lineno)s: %(message)s'
        },
        'simple': {
            '()': 'djangocolors_formatter.DjangoColorsFormatter', # colored output
            'format': '%(levelname)s %(name)s %(filename)s@%(lineno)s: %(message)s'
        },
    },
     # omitting the handler 'level' setting so that all messages are passed and we do level filtering in 'loggers'
    'handlers': {
        'null': {
            'class':'django.utils.log.NullHandler',
        },
        'console':{
            'class':'logging.StreamHandler',
            'formatter': 'simple',
        },
        'mail_admins': {
            'filters': ['require_debug_false'],
            'class': 'django.utils.log.AdminEmailHandler',
            'formatter': 'verbose'
        }
    },
    'loggers': {
        '': { 
            'handlers': ['mail_admins', 'console'],
            'level': 'WARNING',
        },
    }
}

Sample console logging output using django-colors-formatter: