How to write custom python logging handler?

Question

How to write custom console log function to output only on the console window log messages on a single line (not append) until the first regular log record.

progress = ProgressConsoleHandler()
console  = logging.StreamHandler()  

logger = logging.getLogger('test')
logger.setLevel(logging.DEBUG) 
logger.addHandler(console)  
logger.addHandler(progress)

logger.info('test1')
for i in range(3):
    logger.progress('remaining %d seconds' % i)
    time.sleep(1)   
logger.info('test2')

So that the console output is only three lines:

INFO: test1
remaining 0 seconds... 
INFO: test2

Any suggestions on the best way on how to implement this?