code: def stream(identifier, priority=LOG_DEBUG, level_prefix=False):
      r
  
      fd = stream_fd(identifier, priority, level_prefix)
      return _os.fdopen(fd, 'w', 1)
docs: r"""Return a file object wrapping a stream to journal.
  
      Log messages written to this file as simple newline sepearted
      text strings are written to the journal.
  
      The file will be line buffered, so messages are actually sent
      after a newline character is written.
  
      >>> stream = journal.stream('myapp')
      >>> stream
      <open file '<fdopen>', mode 'w' at 0x...>
      >>> stream.write('message...\n')
  
      will produce the following message in the journal::
  
        PRIORITY=7
        SYSLOG_IDENTIFIER=myapp
        MESSAGE=message...
  
      Using the interface with print might be more convinient:
  
      >>> from __future__ import print_function
      >>> print('message...', file=stream)
  
      priority is the syslog priority, one of `LOG_EMERG`,
      `LOG_ALERT`, `LOG_CRIT`, `LOG_ERR`, `LOG_WARNING`,
      `LOG_NOTICE`, `LOG_INFO`, `LOG_DEBUG`.
  
      level_prefix is a boolean. If true, kernel-style log priority
      level prefixes (such as '<1>') are interpreted. See
      sd-daemon(3) for more information.