import logging

LOG_FILENAME = 'logging_example.out'
logging.basicConfig(filename=LOG_FILENAME,
                    level=logging.DEBUG,
                    )

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

f = open(LOG_FILENAME, 'rt')
try:
    body = f.read()
finally:
    f.close()

print 'FILE:'
print body

import glob
import logging
import logging.handlers

LOG_FILENAME = 'logging_rotatingfile_example.out'

# 必要なログレベルをもつロガーを設定する
my_logger = logging.getLogger('MyLogger')
my_logger.setLevel(logging.DEBUG)

# ロガーに対するハンドラにメッセージを追加する
handler = logging.handlers.RotatingFileHandler(LOG_FILENAME,
                                               maxBytes=20,
                                               backupCount=5,
                                               )
my_logger.addHandler(handler)

# メッセージをログ出力する
for i in range(20):
    my_logger.debug('i = %d' % i)

# 作成されたファイルを調べる
logfiles = glob.glob('%s*' % LOG_FILENAME)
for filename in logfiles:
    print filename

import logging
import sys

LEVELS = { 'debug':logging.DEBUG,
            'info':logging.INFO,
            'warning':logging.WARNING,
            'error':logging.ERROR,
            'critical':logging.CRITICAL,
            }

if len(sys.argv) > 1:
    level_name = sys.argv[1]
    level = LEVELS.get(level_name, logging.NOTSET)
    logging.basicConfig(level=level)

logging.debug('This is a debug message')
logging.info('This is an info message')
logging.warning('This is a warning message')
logging.error('This is an error message')
logging.critical('This is a critical error message')

import logging

logging.basicConfig(level=logging.WARNING)

logger1 = logging.getLogger('package1.module1')
logger2 = logging.getLogger('package2.module2')

logger1.warning('This message comes from one module')
logger2.warning('And this message comes from another module')