logging调试程序python

电玩女神 2022-05-22 10:58 298阅读 0赞

### 使用logging类记录错误 ###

*  我们可以使用print()来调试程序，但如果到处是print()，想关闭又得一个个去修改。
 *  使用logging类，我们可以记录各种级别的错误，通过配置参数，可以控制显示哪些错误记录。

### 错误级别： ###

*  CRITICAL = 50
 *  FATAL = CRITICAL
 *  ERROR = 40
 *  WARNING = 30
 *  WARN = WARNING
 *  INFO = 20
 *  DEBUG = 10
 *  NOTSET = 0
    
    ### 对应的方法： ###
 *  logging.critical()
 *  logging.fatal()
 *  logging.error()
 *  logging.warning()
 *  logging.warn()
 *  logging.info()

*  logging.debug()

例子１　控制logging level为error

#!/usr/bin/python
    # coding: utf-8
    
    import logging
    
    # logging.basicConfig(level=logging.NOTSET)
    logging.basicConfig(level=logging.ERROR)
    
    def cal(m, n):
        if n == 0:
            # raise ValueError('Illegal value: %d' % n)
            logging.info('Illegal value: %d' % n)
            
        logging.debug("debug_test")
        logging.warning("warning_test")
        logging.info("info_test")
        logging.error("error_test")
        logging.fatal("fatal_test")
        return  m * n
    
    try:
        r = cal(6, 0)
        print(r)
    except Exception as e:
        print(e)

输出：

ERROR:root:error_test
    CRITICAL:root:fatal_test

例子2　控制logging level为WARNING

#!/usr/bin/python
    # coding: utf-8
    
    import logging
    
    # logging.basicConfig(level=logging.NOTSET)
    logging.basicConfig(level=logging.WARNING)
    
    def cal(m, n):
        if n == 0:
            # raise ValueError('Illegal value: %d' % n)
            logging.info('Illegal value: %d' % n)
            
        logging.debug("debug_test")
        logging.warning("warning_test")
        logging.info("info_test")
        logging.error("error_test")
        logging.fatal("fatal_test")
        return  m * n
    
    try:
        r = cal(6, 0)
        print(r)
    except Exception as e:
        print(e)

输出：

WARNING:root:warning_test
    ERROR:root:error_test
    CRITICAL:root:fatal_test

例子３　控制logging level为DEBUG

#!/usr/bin/python
    # coding: utf-8
    
    import logging
    
    # logging.basicConfig(level=logging.NOTSET)
    logging.basicConfig(level=logging.DEBUG)
    
    def cal(m, n):
        if n == 0:
            # raise ValueError('Illegal value: %d' % n)
            logging.info('Illegal value: %d' % n)
            
        logging.debug("debug_test")
        logging.warning("warning_test")
        logging.info("info_test")
        logging.error("error_test")
        logging.fatal("fatal_test")
        return  m * n
    
    try:
        r = cal(6, 0)
        print(r)
    except Exception as e:
        print(e)

输出：

INFO:root:Illegal value: 0
    DEBUG:root:debug_test
    WARNING:root:warning_test
    INFO:root:info_test
    ERROR:root:error_test
    CRITICAL:root:fatal_test