python writes logs to files and console instances via logging

As shown below:

import logging 
 
#  create 1 a logger 
logger = logging.getLogger('mylogger') 
logger.setLevel(logging.DEBUG) 
 
#  create 1 a handler For writing to log files  
fh = logging.FileHandler('test.log') 
fh.setLevel(logging.DEBUG) 
 
#  To create a 1 a handler For output to the console  
ch = logging.StreamHandler() 
ch.setLevel(logging.DEBUG) 
 
#  define handler Output format of  
formatter = logging.Formatter('[%(asctime)s][%(thread)d][%(filename)s][line: %(lineno)d][%(levelname)s] ## %(message)s')
fh.setFormatter(formatter) 
ch.setFormatter(formatter) 
 
#  to logger add handler 
logger.addHandler(fh) 
logger.addHandler(ch) 
 
#  record 1 A log  
logger.info('foorbar') 

For the formatter configuration, %( < dict key > )s is a dictionary of keyword substitution. Keywords provided include: