PyYaml does not create logging handler classes correctly in Python 2.7

[jordi.puigsegur@…]

logging.FileHandler? and logging.RotatingFileHandler? (haven't tried other handlers) do not get correctly initialized in python 2.7 when loaded using PyYaml?.

This example reproduces the problem:

import logging
import logging.handlers
import yaml

logger = logging.getLogger() # root logger

# Option 1 - OK
##handler = logging.handlers.RotatingFileHandler(filename = "test.log", maxBytes = 262144, backupCount = 3)

# Option 2 - RotatingFileHandler fails when created through yaml
handler = yaml.load("""
!!python/object/new:logging.handlers.RotatingFileHandler
    kwds:
        filename: test.log
        maxBytes: 262144
        backupCount: 3
""")

# Option 3 - FileHandler also fails when created through yaml
##handler = yaml.load("""
##!!python/object/new:logging.FileHandler
##    kwds:
##        filename: test.log
##""")

logger.addHandler(handler)

logger.warning("test handler")

The example above works in python 2.6 and 2.5, but fails in python 2.7. In both cases I am using the latest version of PyYaml?: 3.10

I've opened a ticket in python ( http://bugs.python.org/issue15616) and it seems that Logging changed from old-style classes in 2.6 to new-style classes in 2.7 and that may be the reason.