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	`1`	`+# 4-9 异常处理`
	`2`	`+异常是程序运行当中,因为写程序时的疏漏、代码的安全性、值运算等,造成的错误,而影响程序正常运行。`
	`3`	`+`
	`4`	`+一但异常产生,如果不做捕获处理,程序就会停止运行`
	`5`	`+`
	`6`	`+python提供了强大的异常处理能力(python针对不同类型的异常定义了很多的类来处理,同样也可以自定义异常),可以准确的输出异常信`
	`7`	`+`
	`8`	`+息,方便快速找到异常点`
	`9`	`+`
	`10`	`+异常也不一定,都是有害的,在项目中,也可以利用异常的特点,做一些小窍门的动作`
	`11`	`+`
	`12`	`+python中异常捕获主句为try..except..finally`
	`13`	`+`
	`14`	`+- try 标识异常检测代码段的开始`
	`15`	`+- except 捕获异常,并处理异常`
	`16`	`+- finally`
	`17`	`+### 代码区 1`
	`18`	+```python
	`19`	`+1 x = 'a'`
	`20`	`+2`
	`21`	`+3 try:`
	`22`	`+4 b = x + 1`
	`23`	`+5 except:`
	`24`	`+6 print('出异常了')`
	`25`	`+7`
	`26`	+```
	`27`	`+![4](https://user-images.githubusercontent.com/103555341/163546933-bee710b5-943e-454e-b00d-922d2b897614.jpg)`
	`28`	+```python
	`29`	`+出异常了`
	`30`	+```
	`31`	`+`
	`32`	`+`
	`33`	`+`
	`34`	`+`
	`35`	`+`

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