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()
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