old_contents: from .interface import Scheduler, Executor, OperatorMaster
  from .scheduler import MesosSchedulerDriver
  from .executor import MesosExecutorDriver
  from .operator_v1 import MesosOperatorMasterDriver, MesosOperatorAgentDriver
  from .utils import encode_data, decode_data
  import logging
  
  
  fmt = '%(asctime)-15s [%(levelname)s] [%(threadName)s] [%(name)-9s:%(lineno)d] %(message)s'
  logging.basicConfig(format=fmt, level=logging.INFO)
  
  
  __VERSION__ = '0.3.8'
  
  __all__ = (
      'Scheduler',
      'MesosSchedulerDriver',
      'Executor',
      'MesosExecutorDriver',
      'encode_data',
      'decode_data',
      'OperatorMaster',
      'MesosOperatorMasterDriver',
      'MesosOperatorAgentDriver',
  )
  
new_contents: import sys
  import logging
  
  from .interface import Scheduler, Executor, OperatorMaster
  from .scheduler import MesosSchedulerDriver
  from .executor import MesosExecutorDriver
  from .operator_v1 import MesosOperatorMasterDriver, MesosOperatorAgentDriver
  from .utils import encode_data, decode_data
  
  
  LOG_FMT = '%(asctime)-15s [%(levelname)s] [%(threadName)s]' \
        ' [%(name)-9s:%(lineno)d] %(message)s'
  DATE_FMT = '%Y-%m-%d %H:%M:%S'
  
  logger = logging.getLogger('pymesos')
  handler = logging.StreamHandler(stream=sys.stderr)
  handler.setFormatter(logging.Formatter(LOG_FMT, DATE_FMT))
  logger.addHandler(handler)
  logger.setLevel(logging.INFO)
  
  
  __VERSION__ = '0.3.9'
  
  __all__ = (
      'Scheduler',
      'MesosSchedulerDriver',
      'Executor',
      'MesosExecutorDriver',
      'encode_data',
      'decode_data',
      'OperatorMaster',
      'MesosOperatorMasterDriver',
      'MesosOperatorAgentDriver',
  )
  
subject: add logger handler