old_contents: import logging.config
  import os
  import warnings
  import sys
  
  EXT_STDERR = 'ext://stderr'
  
  DEFAULT_FORMATTER = logging.Formatter(
      '%(asctime)s %(name)-6s %(levelname)-8s %(message)s', '%b %d %H:%M:%S')
  
  STDERR_HANDLER = logging.StreamHandler(sys.stderr)
  STDERR_HANDLER.setFormatter(DEFAULT_FORMATTER)
  
  _LOGGING_INITED = False
  
  
  def init_logging(loglevel, logfile=EXT_STDERR):
      """Set up logging.
  
      This method attaches log handlers to the root logger:
          - a stderr handler (only if the root logger has no other handlers)
          - a file handler if specified
  
      When a logfile is specified, the stderr handler will only log critical
      events.
  
      This routine enables asyncio debug mode if `loglevel` is 'debug'.
      """
      global _LOGGING_INITED  # pylint: disable=global-statement
      if _LOGGING_INITED:
          # Make sure we only initialize logging once.
          set_loglevel(loglevel)
          return
      _LOGGING_INITED = True
  
      _make_default_handlers(logfile)
  
      set_loglevel(loglevel)
      logging.captureWarnings(True)
      warnings.simplefilter('always')
  
      if loglevel.lower() == 'debug':
          os.environ['PYTHONASYNCIODEBUG'] = '1'
  
      asyncio_logger = logging.getLogger('asyncio')
      asyncio_logger.setLevel('WARNING')
  
  
  def set_loglevel(loglevel):
      """Change current log level.
      """
      ofp_logger = logging.getLogger(__package__)
      ofp_logger.setLevel(loglevel.upper())
  
  
  def _make_default_handlers(logfile):
      """Prepare the default loggers.
      """
      root_logger = logging.getLogger()
      if not root_logger.hasHandlers():
          root_logger.addHandler(STDERR_HANDLER)
  
      if logfile and logfile != EXT_STDERR:
          logfile_handler = _make_logfile_handler(logfile)
          logfile_handler.setFormatter(DEFAULT_FORMATTER)
          root_logger.addHandler(logfile_handler)
          # When there is a log file, only log critical events to stderr.
          STDERR_HANDLER.setLevel('CRITICAL')
  
  
  def _make_logfile_handler(logfile):
      """Return log file handler."""
      return logging.handlers.RotatingFileHandler(
          logfile, maxBytes=2**20, backupCount=10, encoding='utf8')
  
new_contents: import logging.config
  import os
  import warnings
  import sys
  
  EXT_STDERR = 'ext://stderr'
  
  DEFAULT_FORMATTER = logging.Formatter(
      '%(asctime)s.%(msecs)03d %(name)-6s %(levelname)-8s %(message)s', '%b %d %H:%M:%S')
  
  STDERR_HANDLER = logging.StreamHandler(sys.stderr)
  STDERR_HANDLER.setFormatter(DEFAULT_FORMATTER)
  
  _LOGGING_INITED = False
  
  
  def init_logging(loglevel, logfile=EXT_STDERR):
      """Set up logging.
  
      This method attaches log handlers to the root logger:
          - a stderr handler (only if the root logger has no other handlers)
          - a file handler if specified
  
      When a logfile is specified, the stderr handler will only log critical
      events.
  
      This routine enables asyncio debug mode if `loglevel` is 'debug'.
      """
      global _LOGGING_INITED  # pylint: disable=global-statement
      if _LOGGING_INITED:
          # Make sure we only initialize logging once.
          set_loglevel(loglevel)
          return
      _LOGGING_INITED = True
  
      _make_default_handlers(logfile)
  
      set_loglevel(loglevel)
      logging.captureWarnings(True)
      warnings.simplefilter('always')
  
      if loglevel.lower() == 'debug':
          os.environ['PYTHONASYNCIODEBUG'] = '1'
  
      asyncio_logger = logging.getLogger('asyncio')
      asyncio_logger.setLevel('WARNING')
  
  
  def set_loglevel(loglevel):
      """Change current log level.
      """
      ofp_logger = logging.getLogger(__package__)
      ofp_logger.setLevel(loglevel.upper())
  
  
  def _make_default_handlers(logfile):
      """Prepare the default loggers.
      """
      root_logger = logging.getLogger()
      if not root_logger.hasHandlers():
          root_logger.addHandler(STDERR_HANDLER)
  
      if logfile and logfile != EXT_STDERR:
          logfile_handler = _make_logfile_handler(logfile)
          logfile_handler.setFormatter(DEFAULT_FORMATTER)
          root_logger.addHandler(logfile_handler)
          # When there is a log file, only log critical events to stderr.
          STDERR_HANDLER.setLevel('CRITICAL')
  
  
  def _make_logfile_handler(logfile):
      """Return log file handler."""
      return logging.handlers.RotatingFileHandler(
          logfile, maxBytes=2**20, backupCount=10, encoding='utf8')
  
subject: Include milliseoncds in logging timestamp.