def __init__(self, log=None):
"""A base class for config loaders.
log : instance of :class:`logging.Logger` to use.
By default loger of :meth:`traitlets.config.application.Application.instance()`
will be used
Examples
--------
>>> cl = ConfigLoader()
>>> config = cl.load_config()
>>> config
{}
"""
self.clear()
if log is None:
self.log = self._log_default()
self.log.debug('Using default logger')
else:
self.log = log
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