为什么INFO记录在DEBUG日志中

Question

I am using yaml to config logging for my Python application.

version: 1
disable_existing_loggers: False

formatters:
    standard:
        format: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"

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

    info_file_handler:
        class: logging.handlers.RotatingFileHandler
        level: INFO
        formatter: standard
        filename: info.log
        maxBytes: 10485760 # 10MB
        backupCount: 20
        encoding: utf8

    error_file_handler:
        class: logging.handlers.RotatingFileHandler
        level: ERROR
        formatter: standard
        filename: errors.log
        maxBytes: 10485760 # 10MB
        backupCount: 20
        encoding: utf8

    debug_file_handler:
        class: logging.handlers.RotatingFileHandler
        level: DEBUG
        formatter: standard
        filename: debug.log
        maxBytes: 10485760 # 10MB
        backupCount: 20
        encoding: utf8

loggers:
        db_ops:
        level: DEBUG
        handlers: [info_file_handler, error_file_handler, debug_file_handler]
        propagate: true

In module db_ops , I use both logger.info and logger.debug for different levels of logging. When I run the app, while INFO did get output to info.log, both INFO and DEBUG messages are output to debug.log.

What is the right way to separate the log to different files based on the level?

Answer 1

The levels of python loggers and handlers are thresholds. If you specify your level as DEBUG, it means that anything equal or above DEBUG will be logged.

If you want to have a DEBUG logging only, you'll have to additionally assign a filter that will filter anything but DEBUG message.