Python: Configure logger with yaml to open logfile in write mode

Question

I have the following configuration of a logger in a the file loggingConfig.yml

version: 1
disable_existing_loggers: False
    formatters:
        simple:
            format: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"

handlers:
    console:
    class: logging.StreamHandler
    level: DEBUG
    formatter: simple
    stream: ext://sys.stdout

file_handler:
    class: logging.FileHandler
    level: INFO
    formatter: simple
    filename: info.log
    encoding: utf8

loggers:
    my_module:
        level: ERROR
        handlers: [console]
        propagate: no

root:
     level: INFO
     handlers: [console, file_handler]

And the following python code:

import logging
import logging.config
import yaml

with open('loggingConfig.yml', 'rt') as f:
    config = yaml.safe_load(f.read())
    logging.config.dictConfig(config)

logger = logging.getLogger(__name__)

logger.info('TestLogger')

This works fine, but now I would like to open the logfile in write mode and not in append mode. I wasn't able to find any example which use a yaml file and opens the logfile in write mode.

I only found, that open in write mode can be done using the fileConfig

logging.config.fileConfig('logging.conf')

and specify args in the logging.conf file:

args=('info.log', 'w')

Is there any way how I can do this using the yaml file or manipulating the config in the sourcecode?

Answer 1

Try using the following configuration:

file_handler:
    class: logging.FileHandler
    level: INFO
    formatter: simple
    filename: info.log
    encoding: utf8
    mode: w

The default mode is 'a' which means append . More info on that here