Filters - Python logging

The third concept is filters. They are similar to log levels in that they can discard unmatched log records, but are entirely custom. A filter accepts a log record and returns a boolean. You can filter on any conceivable field of the LogRecord.

Filters can be made by extending the logging.Filter class and implementing the filter method.

class CustomFilter(logging.Filter):
    def filter(self, record: logging.LogRecord) -> bool:
        return record.levelno >= logging.WARNING

logger.addFilter(CustomFilter())

Alternatively, you can simply create a function.

def custom_filter(record: logging.LogRecord) -> bool:
    return record.levelno >= logging.WARNING
logger.addFilter(custom_filter)

Chapter 7: Filters

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