python捕获分类：

1、明确类型进行捕获

d={
   "a":1}try:    d["key"]except KeyError as e: #只能捕获keyerror这一种错误   print('出错了')

try:    1/0    d['key']except ZeroDivisionError as e: #捕获ZeroDivisionError这一种错误    print("error")C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.pyerror

d={
   "a":1}try:  #当try中有多个错误是，根据位置在前的错误会报错走捕获，后面的错误捕获不再进行输出    d['key']    1/0except ZeroDivisionError as e: #捕获ZeroDivisionError这一种错误    print("error")except KeyError as e: #只能捕获keyerror这一种错误   print('出错了')C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.py出错了  #因为keyerror的错误在前，所以程序走了其捕获异常代码，未走获ZeroDivisionError这个捕获

2、未明确类型进行统一捕获

try:    1/0except KeyError as e:  #只能捕获一种错误    print("error")C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.pyTraceback (most recent call last):  File "D:/study/python/test/dd.py", line 89, in 
     
          1/0ZeroDivisionError: division by zero
     

try:    1/0except Exception as e:  #捕获任何错误    print("error")C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.pyerror

try:    d[9]except Exception as e:  #捕获任何错误    print('error')C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.pyerror

3、捕获错误带分支逻辑

try:    a='000'except Exception as e:  #当有错误运行这里的代码    print('error')else: #当没有捕获到错误就运行这里的代码    print('无错误走这里')C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.py无错误走这里

try:    a=bexcept Exception as e:  #当有错误运行这里的代码    print('有错误运行这里')else: #当没有捕获到错误就运行这里的代码    print('无错误走这里')C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.py有错误运行这里

 4、捕获带finally

try:    a=bexcept Exception as e:  #当有错误运行这里的代码    print('有错误运行这里')else: #当没有捕获到错误就运行这里的代码    print('无错误走这里')finally: #出错还是不出错程序都会运行这里的代码    print('出错还是不出错我肯定是要运行的')C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.py有错误运行这里出错还是不出错我肯定是要运行的

try:    a=1except Exception as e:  #当有错误运行这里的代码    print('有错误运行这里')else: #当没有捕获到错误就运行这里的代码    print('无错误走这里')finally: #出错还是不出错程序都会运行这里的代码    print('出错还是不出错我肯定是要运行的')C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.py无错误走这里出错还是不出错我肯定是要运行的

 5、异常的输出

import tracebacktry:    a=aexcept Exception as e:    print(e) #输出具体的错误内容print('=====================')try:    a=aexcept Exception as e:    print(traceback.format_exc()) #输出详细的错误内容C:\Users\zhaow\AppData\Local\Programs\Python\Python37\python.exe D:/study/python/test/dd.pyname 'a' is not defined=====================Traceback (most recent call last):  File "D:/study/python/test/dd.py", line 94, in 
      
           a=aNameError: name 'a' is not defined