dictConfig
- Python course
- Advanced
- Lesson 71/83
- 5 min
Learn advanced config with logging.config.dictConfig.
dictConfig
logging.config.dictConfig sets up a complex logging configuration from a dict. Handlers, formatters and loggers are defined separately; this is good for working with configuration loaded from a file.
import logging.config
config = {
"version": 1,
"formatters": {"simple": {"format": "%(levelname)s:%(message)s"}},
"handlers": {"console": {"class": "logging.StreamHandler", "formatter": "simple"}},
"loggers": {"myapp": {"handlers": ["console"], "level": "DEBUG"}},
}
logging.config.dictConfig(config)version: 1 is always given. The dict structure lets you manage many loggers and handlers from one place.
Dict sections
The dictConfig dict has four main sections: formatters, handlers, loggers and root. Each is a dict of dicts.
config = {
"version": 1,
"formatters": {"simple": {...}},
"handlers": {"console": {...}},
"loggers": {"myapp": {...}},
}A handler refers to a formatter by name; a logger refers to a handler by name. This makes components reusable.
Practice Log with dictConfig
Start with import logging.config. Define a dict config: "version": 1, "formatters": {"simple": {"format": "%(levelname)s:%(message)s"}}, "handlers": {"console": {"class": "logging.StreamHandler", "formatter": "simple"}}, "loggers": {"myapp": {"handlers": ["console"], "level": "DEBUG"}}. Call logging.config.dictConfig(config). Get a logger with logger = logging.getLogger("myapp"). Also add the import logging line. Write logger.info("merhaba").
Starter code
# bring in logging.config and logging
# define config dict: version, formatters, handlers, loggers
# load the configuration with dictConfig
# get the 'myapp' logger
# write 'merhaba' at info levelSample solution
import logging
import logging.config
config = {
"version": 1,
"formatters": {"simple": {"format": "%(levelname)s:%(message)s"}},
"handlers": {"console": {"class": "logging.StreamHandler", "formatter": "simple"}},
"loggers": {"myapp": {"handlers": ["console"], "level": "DEBUG"}},
}
logging.config.dictConfig(config)
logger = logging.getLogger("myapp")
logger.info("merhaba")Expected output
INFO:merhaba
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Complete the dictConfig call
import logging.config
logging.config.____(config)import logging.config
logging.config.dictConfig(config)Explanation: logging.config.dictConfig(config) loads the configuration.
2 What does the 'version' key do in a dictConfig dict?
- Specifies the logger name
- Specifies the configuration version Correct answer
- Specifies the file path
- Specifies the level
Explanation: The version key specifies the configuration version; usually 1.
3 Match the dictConfig concepts
| Term | Meaning |
|---|---|
version |
Specifies the version |
formatters |
Defines formatters |
handlers |
Defines handlers |
loggers |
Defines loggers |