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Create logger.py`

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	`1`	`+#!/usr/bin/env python`
	`2`	`+# coding: utf8`
	`3`	`+import logging`
	`4`	`+from logging.handlers import TimedRotatingFileHandler`
	`5`	`+`
	`6`	`+logger = None`
	`7`	`+log_name = "db.logger"`
	`8`	`+file_name = "db.log"`
	`9`	`+`
	`10`	`+`
	`11`	`+def init_logger():`
	`12`	`+ global logger, log_name`
	`13`	`+ logger = logging.getLogger(log_name)`
	`14`	`+ logger.setLevel(logging.DEBUG)`
	`15`	`+`
	`16`	`+ # set rotate log files`
	`17`	`+ file_handler = TimedRotatingFileHandler(file_name, 'S', 1, 3)`
	`18`	`+ formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")`
	`19`	`+ file_handler.suffix = "%Y-%m-%d_%H-%M-%S"`
	`20`	`+ file_handler.setFormatter(formatter)`
	`21`	`+ logger.addHandler(file_handler)`
	`22`	`+`
	`23`	`+`
	`24`	`+def get_logger():`
	`25`	`+ global logger`
	`26`	`+ if not logger:`
	`27`	`+ init_logger()`
	`28`	`+ return logger`

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