The other solutions were not working for me. Here a more harsh hack, that does the job for me (I'm using weasyprint version 64.0):

import logging
import logging.config
from weasyprint import HTML

# Setup logging configuration
LOGGING_CONFIG = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "simple": {
            "format": "%(levelname)s %(asctime)s %(filename)s %(message)s"
        },
    },
    "handlers": {
        "null_handler": {
            "class": "logging.NullHandler",
        },
        "console": {
            "level": "INFO",
            "class": "logging.StreamHandler",
            "formatter": "simple",
            "stream": "ext://sys.stdout",  # Default to standard output
        },
    },
    "loggers": {
        "fontTools": {
            "level": "ERROR",  # Suppress DEBUG and INFO for fontTools
            "handlers": ["null_handler"],
            "propagate": False
        }
    },
    "root": {
        "handlers": ["console"],
        "level": "INFO",  # Global level set to INFO
    },
}

logging.config.dictConfig(LOGGING_CONFIG)




# Retrieve the logger for fontTools
fonttools_logger = logging.getLogger('fontTools')

# Check if the logger has handlers
has_handlers = bool(fonttools_logger.handlers)

# Print basic configuration details
print(f"Logger for fontTools found: {'Yes' if fonttools_logger else 'No'}")
print(f"Logger level: {logging.getLevelName(fonttools_logger.level)}")
print(f"Has handlers: {'Yes' if has_handlers else 'No'}")
print("Handlers attached to fontTools logger:")
for handler in fonttools_logger.handlers:
    print(f"  - {type(handler).__name__} with level {logging.getLevelName(handler.level)}")

# Check if the logger is set to propagate its messages
print(f"Propagate: {fonttools_logger.propagate}")