python错误继承表：
10余年的蓝山网站建设经验，针对设计、前端、开发、售后、文案、推广等六对一服务，响应快，48小时及时工作处理。全网整合营销推广的优势是能够根据用户设备显示端的尺寸不同，自动调整蓝山建站的显示方式，使网站能够适用不同显示终端，在浏览器中调整网站的宽度，无论在任何一种浏览器上浏览网站，都能展现优雅布局与设计，从而大程度地提升浏览体验。创新互联建站从事“蓝山网站设计”,“蓝山网站推广”以来，每个客户项目都认真落实执行。
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, inmain() 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
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
