Pyhon学习笔记4:异常

1.文件的异常处理：try except FileNotFoundError

try:

open("abc.txt",'r')

except FileNotFoundError:

print("异常了！")

2.name的异常 try except NameError

try :

print(aa)

except NameError:

print("异常了！")

3.可以使用BaseException类处理所以的异常

try:

open("abc.txt",'r')

print(aa)

except BaseException:

print("异常了！")

4.打印异常日志

try:

# open("abc.txt",'r')

print(aa)

except BaseException as msg:

print("异常了！")

print(msg)

5.python中常见的异常：

（1）try ...else..

try:

aa="异常测试"

print(aa)

except Exception as msg:
print(msg)

else:

print("没有异常！")

(2)try ...finally..

try:

# open("abc.txt",'r')

print(aa)

except BaseException as msg:

print("异常了！")

print(msg)

finally:

print("我都会执行！")

6.抛出异常