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Python异常

  • 2026-02-06 19:42:32
Python异常

写在前面

在任何编程语言中都难免会遇到异常(报错),如何查看报错、理解报错、避免报错、捕获报错信息,都是我们需要去应对的环节。

一、异常定义

异常:当程序检测到错误时,Python解释器就无法继续执行了,此时会出现一些错误的提示,这就是所谓的”异常”,也就是我们常说的BUG例如最常见的bug,打错函数名称:
pring("Biomamba")# 这时就会返回报错,并告诉发生错误的位置和具体原因

NameError: name ‘pring’ is not defined

二、异常捕获

程序遇到bug时会存在两种情况:1、终止程序。2、提醒出现的bug并让整个程序继续运行。情况2就需要进行异常捕获,从而防止整个程序因为一些小bug而停止运行异常捕获基本语法:try:可能错误发生的代码 except:如果出现异常则执行的代码
# 捕获异常(默认不区分异常类型):try:    prinf('这条代码可能有异常')except:print("上条代码有异常,本条被输出")# 可以看到以上几行代码没有报错,输出的内容则是except后的语句
## 上条代码有异常,本条被输出
# 捕获指定异常# 例如这里捕获变量名称未定义的异常"NameError"try:print(Biomamba)exceptNameErroras aerror:print("Biomamba未被定义")# 可以看到错误成功被捕获,且备选方案被执行
## Biomamba未被定义
# 捕获指定异常# 这里我们让异常不属于NameError:try:print(1/0)exceptNameError :print("Biomamba未被定义")# 可以看到错误没有被捕获,提示信息被输出,备选代码也没有被执行

ZeroDivisionError: division by zero

# 捕获多个异常,except(异常1,异常2)try:print(1/0)except(NameError,ZeroDivisionError):print("这是备选代码执行结果")# 可以看出备选代码被成功执行
## 这是备选代码执行结果
# 捕获所有类型异常try:print(1/0)print(Biomamba)exceptException:print("这是备选代码执行结果")# 可以看出备选代码被成功执行

## 这是备选代码执行结果

三、异常else

除了except之外,还可以设置没有异常时选择执行的代码:
try:print("这里没有异常")except:print("这是有异常后的执行结果")else:print("这是没有捕获到异常的执行结果")# 大家可以体会一下上述几行代码的执行逻辑
## 这里没有异常## 这是没有捕获到异常的执行结果

四、异常finally

不管有没有异常,finally所包含的语句均会被执行:
# 有异常try:1/0print("这里没有异常")except:print("这是有异常后的执行结果")else:print("这是没有捕获到异常的执行结果")finally:print("我在所有条件下都会被执行")# 大家可以体会一下上述几行代码的执行逻辑
## 这是有异常后的执行结果## 我在所有条件下都会被执行
# 无异常try:1+1print("这里没有异常")except:print("这是有异常后的执行结果")else:print("这是没有捕获到异常的执行结果")finally:print("我在所有条件下都会被执行")# 大家可以体会一下上述几行代码的执行逻辑
## 2## 这里没有异常## 这是没有捕获到异常的执行结果## 我在所有条件下都会被执行

五、异常传递

异常是具有传递性的,可以用as来定义接收异常的变量:
try:1/0exceptExceptionas my_error:print("异常被成功捕获,下面是异常的具体信息:\n")print(my_error)# 可以看到除数异常被成功捕获
## 异常被成功捕获,下面是异常的具体信息:## ## division by zero
# 但异常的捕获是一个局部变量,跳出异常捕获语句后捕获的异常变量就失效了:try:1/0exceptExceptionas my_error:print("异常被成功捕获,下面是异常的具体信息:\n")print(my_error)# 可以看到除数异常被成功捕获,但my_error变量不存在

NameError: name ‘my_error’ is not defined

往期回顾

生信Python速查手册

Python安装(Windows+Linux)

Python的"Rstudio"——Pycharm

码Python神器:jupyter notebook

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Python循环语句

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Python文件操作

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  1. CONNECT:[ UseTime:0.000527s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000823s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003600s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004048s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000674s ]
  6. SELECT * FROM `set` [ RunTime:0.002007s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000653s ]
  8. SELECT * FROM `article` WHERE `id` = 464576 LIMIT 1 [ RunTime:0.006695s ]
  9. UPDATE `article` SET `lasttime` = 1770525179 WHERE `id` = 464576 [ RunTime:0.024474s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000396s ]
  11. SELECT * FROM `article` WHERE `id` < 464576 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000813s ]
  12. SELECT * FROM `article` WHERE `id` > 464576 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008110s ]
  13. SELECT * FROM `article` WHERE `id` < 464576 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012390s ]
  14. SELECT * FROM `article` WHERE `id` < 464576 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003626s ]
  15. SELECT * FROM `article` WHERE `id` < 464576 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.060620s ]
0.197611s