python 错误处理：try..exc
python错误继承表：
https://docs.python.org/3/library/exceptions.html#exception-hierarchy
格式：
def 函数()：
try:
内容 ###正确输出
except 错误表 in e:
输出内容 ###错误输出
finally:
输出内容 ##必定输出
print('END') ##必定输出
#!/usr/bin/python
# -*- coding: utf-8 -*-
def foo(s):
return 10 / int(s)
def bar(s):
return foo(s) * 2
def main():
try:
bar('0')
except Exception as e:
print('Error:', e)
finally:
print('finally...')
main()运行结果：
('Error:', ZeroDivisionError('integer division or modulo by zero',))
finally...a.面对函数层层调用，try...except能捕捉得到。
b.类的子类错误也能捕捉得到，如捕捉ValueError错误，顺便也会把UnicodeError也捕捉了
+-- ValueError
| +-- UnicodeError
| +-- UnicodeDecodeError
| +-- UnicodeEncodeError
| +-- UnicodeTranslateError记录错误到日志文件：
#!/usr/bin/python
# -*- coding: utf-8 -*-
import logging ###########记得导入模块
def foo(s):
return 10 / int(s)
def bar(s):
return foo(s) * 2
def main():
try:
bar('0')
except Exception as e:
logging.exception(e) #########模块函数使用
print ('haha')
main()
print ('END')运行结果：
haha
END
ERROR:root:division by zero
Traceback (most recent call last):
File "/usercode/file.py", line 14, in main
bar('0')
File "/usercode/file.py", line 10, in bar
return foo(s) * 2
File "/usercode/file.py", line 7, in foo
return 10 / int(s)
ZeroDivisionError: division by zero当不用错误调试时，普通的程序出错会调用栈Traceback提示错误
def foo(s):
return 10 / int(s)
def bar(s):
return foo(s) * 2
def main():
bar('0')
main()运行结果：
Traceback (most recent call last):
File "/usercode/file.py", line 13, in <module>
main()
File "/usercode/file.py", line 11, in main
bar('0')
File "/usercode/file.py", line 8, in bar
return foo(s) * 2
File "/usercode/file.py", line 5, in foo
return 10 / int(s)
ZeroDivisionError: integer division or modulo by zero抛出错误：raise
def foo(s):
n = int(s)
if n==0:
raise ValueError('invalid value: %s' % s)
return 10 / n
def bar():
try:
foo('0')
except ValueError as e:
print('ValueError!', e)
raise
bar()运行结果：
('ValueError!', ValueError('invalid value: 0',))
Traceback (most recent call last):
File "/usercode/file.py", line 17, in <module>
bar()
File "/usercode/file.py", line 12, in bar
foo('0')
File "/usercode/file.py", line 7, in foo
raise ValueError('invalid value: %s' % s)
ValueError: invalid value: 0本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2019-08-29 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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