Python的logging模块封装，pythonlogging模块,使得logging模块用

Python的logging模块封装，pythonlogging模块,使得logging模块用

使得logging模块用起来更加简单。

http://kodango.me/a-simple-python-log-lib

#!/usr/local/python/bin# coding=utf-8'''Implements a simple log library.This module is a simple encapsulation of logging module to provide a moreconvenient interface to write log. The log will both print to stdout andwrite to log file. It provides a more flexible way to set the log actions,and also very simple. See examples showed below:Example 1: Use default settings    import log    log.debug('hello, world')    log.info('hello, world')    log.error('hello, world')    log.critical('hello, world')Result:Print all log messages to file, and only print log whose level is greaterthan ERROR to stdout. The log file is located in '/tmp/xxx.log' if the module name is xxx.py. The default log file handler is size-rotated, if the log file's size is greater than 20M, then it will be rotated.Example 2: Use set_logger to change settings    # Change limit size in bytes of default rotating action    log.set_logger(limit = 10240) # 10M    # Use time-rotated file handler, each day has a different log file, see    # logging.handlers.TimedRotatingFileHandler for more help about 'when'    log.set_logger(when = 'D', limit = 1)    # Use normal file handler (not rotated)    log.set_logger(backup_count = 0)    # File log level set to INFO, and stdout log level set to DEBUG    log.set_logger(level = 'DEBUG:INFO')    # Both log level set to INFO    log.set_logger(level = 'INFO')    # Change default log file name and log mode    log.set_logger(filename = 'yyy.log', mode = 'w')    # Change default log formatter    log.set_logger(fmt = '[%(levelname)s] %(message)s''''__author__ = "tuantuan.lv <dangoakachan@foxmail.com>"__status__ = "Development"__all__ = ['set_logger', 'debug', 'info', 'warning', 'error',           'critical', 'exception']import osimport sysimport loggingimport logging.handlers# Color escape stringCOLOR_RED='\\033[1;31m'COLOR_GREEN='\\033[1;32m'COLOR_YELLOW='\\033[1;33m'COLOR_BLUE='\\033[1;34m'COLOR_PURPLE='\\033[1;35m'COLOR_CYAN='\\033[1;36m'COLOR_GRAY='\\033[1;37m'COLOR_WHITE='\\033[1;38m'COLOR_RESET='\\033[1;0m'# Define log colorLOG_COLORS = {    'DEBUG': '%s',    'INFO': COLOR_GREEN + '%s' + COLOR_RESET,    'WARNING': COLOR_YELLOW + '%s' + COLOR_RESET,    'ERROR': COLOR_RED + '%s' + COLOR_RESET,    'CRITICAL': COLOR_RED + '%s' + COLOR_RESET,    'EXCEPTION': COLOR_RED + '%s' + COLOR_RESET,}# Global loggerg_logger = Noneclass ColoredFormatter(logging.Formatter):    '''A colorful formatter.'''    def __init__(self, fmt = None, datefmt = None):        logging.Formatter.__init__(self, fmt, datefmt)    def format(self, record):        level_name = record.levelname        msg = logging.Formatter.format(self, record)        return LOG_COLORS.get(level_name, '%s') % msgdef add_handler(cls, level, fmt, colorful, **kwargs):    '''Add a configured handler to the global logger.'''    global g_logger    if isinstance(level, str):        level = getattr(logging, level.upper(), logging.DEBUG)    handler = cls(**kwargs)    handler.setLevel(level)    if colorful:        formatter = ColoredFormatter(fmt)    else:        formatter = logging.Formatter(fmt)    handler.setFormatter(formatter)    g_logger.addHandler(handler)    return handlerdef add_streamhandler(level, fmt):    '''Add a stream handler to the global logger.'''    return add_handler(logging.StreamHandler, level, fmt, True)def add_filehandler(level, fmt, filename , mode, backup_count, limit, when):    '''Add a file handler to the global logger.'''    kwargs = {}    # If the filename is not set, use the default filename    if filename is None:        filename = getattr(sys.modules['__main__'], '__file__', 'log.py')        filename = os.path.basename(filename.replace('.py', '.log'))        filename = os.path.join('/tmp', filename)    kwargs['filename'] = filename    # Choose the filehandler based on the passed arguments    if backup_count == 0: # Use FileHandler        cls = logging.FileHandler        kwargs['mode' ] = mode    elif when is None:  # Use RotatingFileHandler        cls = logging.handlers.RotatingFileHandler        kwargs['maxBytes'] = limit        kwargs['backupCount'] = backup_count        kwargs['mode' ] = mode    else: # Use TimedRotatingFileHandler        cls = logging.handlers.TimedRotatingFileHandler        kwargs['when'] = when        kwargs['interval'] = limit        kwargs['backupCount'] = backup_count    return add_handler(cls, level, fmt, False, **kwargs)def init_logger():    '''Reload the global logger.'''    global g_logger    if g_logger is None:        g_logger = logging.getLogger()    else:        logging.shutdown()        g_logger.handlers = []    g_logger.setLevel(logging.DEBUG)def set_logger(filename = None, mode = 'a', level='ERROR:DEBUG',               fmt = '[%(levelname)s] %(asctime)s %(message)s',               backup_count = 5, limit = 20480, when = None):    '''Configure the global logger.'''    level = level.split(':')    if len(level) == 1: # Both set to the same level        s_level = f_level = level[0]    else:        s_level = level[0]  # StreamHandler log level        f_level = level[1]  # FileHandler log level    init_logger()    add_streamhandler(s_level, fmt)    add_filehandler(f_level, fmt, filename, mode, backup_count, limit, when)    # Import the common log functions for convenient    import_log_funcs()def import_log_funcs():    '''Import the common log functions from the global logger to the module.'''    global g_logger    curr_mod = sys.modules[__name__]    log_funcs = ['debug', 'info', 'warning', 'error', 'critical',                 'exception']    for func_name in log_funcs:        func = getattr(g_logger, func_name)        setattr(curr_mod, func_name, func)# Set a default loggerset_logger()#该片段来自于http://byrx.net