Pyhon学习笔记4:异常-创新互联

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