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import logging

'''

ref. https://docs.python.org/3/library/logging.html

Level DEBUG < INFO < WARNING < ERROR < CRITICAL

'''

def ex1():

# logging.basicConfig(level=logging.DEBUG)

# will print 'warning message' , 'error message', because the default level is WARNING

logging.warning('warning message')

logging.error('error message')

logging.debug('I told you so - debug')

logging.info('I told you so - info')

def ex2():

logging.error('test')

log1 = logging.getLogger('my_app')

log2 = logging.getLogger(__name__)

log1.warning('I told you')

log2.warning('warning message')

def ex3():

# will print all message , because the level is DEBUG

format_log = '%(asctime)s %(levelname)s:%(message)s'

logging.basicConfig(filename='example.log', format=format_log, level=logging.DEBUG)

# logging.basicConfig(format=format_log, level=logging.DEBUG)

logging.debug('This message should go to the log file')

logging.info('So should this')

logging.warning('And this, too')

def ex4():

# multiple-handlers-and-formatter

logger = logging.getLogger(__name__)

logger.setLevel(logging.DEBUG)

log_file = 'my_test_logger.log'

f_log = logging.FileHandler(log_file, mode='w')

f_log.setLevel(logging.ERROR)

# 設定 console 並且定義為 DEBUG

c_log = logging.StreamHandler()

c_log.setLevel(logging.DEBUG)

format_log = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

f_log.setFormatter(format_log)

c_log.setFormatter(format_log)

logger.addHandler(f_log)

logger.addHandler(c_log)

logger.debug('debug message')

logger.info('info message')

logger.warning('warning message')

logger.error('error message')

logger.critical('critical message')

if __name__ == "__main__":

# ex1()

# ex2()

# ex3()

ex4()