I have a config to configure logging:

"file_handler": { "class": "logging.handlers.TimedRotatingFileHandler", "level": "DEBUG", "formatter": "simple", "filename": "development.log", "encoding": "utf8" }

The config as you can see from the example my config is a JSON object. Loading and applying the config is simple and simple: first read the file, then interpret the json module from the standard library and then call dict_config .

I'm not satisfied with the name of the file for the log after the rotation. It is very inconvenient because it has a timestamp as a file extension. I really want to put in the base name, and let the extension be 'log'.

I found a solution to my problem, it is written in en_SO: TimedRotatingFileHandler Changing File Name? . But I don’t really like this decision. It is for runtime, but I would like to ask declaratively, i.e. in the config.

Is it possible, and if so, how?

    1 answer 1

    (if I correctly understood your question) I once solved a similar task as follows:

    my_logging.py:

     import os import datetime import errno import logging.config import logging.handlers import yaml def mkdir_p(path): try: os.makedirs(path, exist_ok=True) # Python>3.2 except TypeError: try: os.makedirs(path) except OSError as exc: # Python >2.5 if exc.errno == errno.EEXIST and os.path.isdir(path): pass else: raise class EvalFileHandler(logging.FileHandler): def __init__(self, **kwargs): fn = eval(os.path.expandvars(kwargs['filename'])) mkdir_p(os.path.dirname(fn)) kwargs['filename'] = fn logging.FileHandler.__init__(self, **kwargs) def setup_logging( config_file='logging.yml', default_level=logging.INFO, env_key_config='LOGGING_CONFIG' ): """Setup logging configuration """ path = config_file value = os.getenv(env_key_config, None) if value: path = value if os.path.exists(path): with open(path, 'rt') as f: config = yaml.load(f.read()) logging.config.dictConfig(config) else: logging.basicConfig(level=default_level)

    logging.yml:

     --- version: 1 disable_existing_loggers: False formatters: default: format: "%(asctime)s - %(name)s - %(levelname)s - %(message)s" simple: format: "%(asctime)s - %(levelname)-8s - %(message)s" short: format: "%(asctime)s - %(message)s" message_only: format: "%(message)s" handlers: console: class: logging.StreamHandler level: DEBUG formatter: simple stream: ext://sys.stdout debug_file_handler: class: my_logging.EvalFileHandler level: DEBUG formatter: simple filename: "__import__('datetime').datetime.now().strftime('$HOME/log/%Y/%m/%Y%m%d-db_jiramatic-debug.log')" encoding: utf8 info_file_handler: class: my_logging.EvalFileHandler level: INFO formatter: simple filename: "__import__('datetime').datetime.now().strftime('$HOME/log/%Y/%m/%Y%m%d-db_jiramatic.log')" encoding: utf8 error_file_handler: class: my_logging.EvalFileHandler level: ERROR formatter: simple filename: "__import__('datetime').datetime.now().strftime('$HOME/log/%Y/%m/%Y%m%d-db_jiramatic-errors.log')" encoding: utf8 loggers: my_project: level: INFO # handlers: [console, info_file_handler, error_file_handler, debug_file_handler] handlers: [console, info_file_handler, error_file_handler] propagate: no root: level: INFO handlers: [console, info_file_handler, error_file_handler]

    then in the main script:

     import my_logging my_logging.setup_logging(config_file='/path/to/logging.yml') logger = logging.getLogger('my_project')