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Here's a tentative suggestion. Does it meet your needs?
import logging
import sys
class LoggerWriter(object):
 def __init__(self, logger='', level=logging.DEBUG):
 if isinstance(logger, str):
 logger = logging.getLogger(logger)
 self.logger = logger
 self.level = level
 self.buffer = ''
 def _output(self, force):
 lines = self.buffer.split('\n')
 if force:
 self.buffer = ''
 else:
 self.buffer = lines.pop()
 for line in lines:
 self.logger.log(self.level, line)
 def flush(self):
 self._output(True)
 def write(self, text):
 self.buffer += text
 self._output(False)
def main():
 stream = LoggerWriter()
 with open('lwtest.txt', 'w') as f:
 print('foo', 1, 'bar\n\n', 2.0, 'baz', file=stream)
 print(file=stream)
 print('foo', 1, 'bar\n\n', 2.0, 'baz', file=f)
 print(file=f)
 print('frob', end=' ', file=stream)
 print('frob', end=' ', file=f)
 f.flush()
 stream.flush()
if __name__ == '__main__':
 logging.basicConfig(level=logging.DEBUG, format='%(levelname)-8s %(message)s',
 filename='lwtest.log')
 sys.exit(main())