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Python学习笔记——从入门到报废(二十三、异常处理)

  • 2026-05-02 07:29:44
Python学习笔记——从入门到报废(二十三、异常处理)

在程序运行的过程中,难免会遇到未知错误(Error或Exception)。例如,某次计算使得变量x变为0,而x在后续计算中会作为除数参与运算,这就会导致程序出错。通常,Python程序一旦遇到错误即结束,后续计算直接终止。很多时候我们并不想这样,依然希望程序能跳过错误继续执行,这时候就需要用到异常处理。

一、异常类型

异常即一个事件,其会在程序执行过程中发生,影响程序的正常执行。通常,在Python无法正常处理程序时就会发生异常。异常是Python对象,表示一个错误。常见的异常包括:

异常类型

说明

Exception

常规错误的基类

OverflowError

数值运算超出最大限制

ZeroDivisionError

或取模

AttributeError

对象没有这个属性

IOError

输入/输出失败

ImportError

导入模块/对象失败,通常是没安装此模块或名称写错

IndexError

序列中没有此索引,例如索引大于序列长度

NameError

未声明/初始化对象

SyntaxError

Python语法错误,如编写不符合语法规范

TypeError

对类型无效的操作

ValueError

传入无效的参数,如调用函数时传入未知参数

UnicodeError

Unicode相关错误,如打开文件时使用错误编码格式

二、异常处理

可以使用“try/except”语句来捕捉程序中的错误,如下即为该语句的语法格式:

try:    codes may raise an exceptionexcept Error1:    codes for meeting error1except Error2, Error3:    codes for meeting error2else:    codes for nothing wrong

(1)异常处理逻辑

try/except语句的执行逻辑是:

  • 执行try内语句,如果遇到异常,就按照异常类型去匹配except语句,并执行该except内的操作;

  • except语句可以有多条,每条后面可以用逗号分隔多种异常类型;

  • 若except不固定某个异常类型,可以写为“except”或“except Exception”或“except Exception as e”,用于捕获所有类型的异常;

  • 如果没有匹配的except,则当前异常会向当前try的上层try逐层传递直至程序最顶层,若上层try语句没有匹配的except,则程序出错终止,输出错误信息;

  • 当try中语句执行时没有异常,如果有else则先执行其中的语句,然后整个try语句结束。

除此之外,try还可以添加finally语句,无论try中是否有异常,都会在最后执行finally中的语句,例如:

try:    print(int("xyz"))except ValueError:    print("ValueError")finally:    print("finally")# Output:# ValueError# finally

(2)异常抛出

某些情况下,尽管程序逻辑没有错误,但是功能逻辑不符合,此时我们也可以使用raise语句手动抛出异常,其格式为:

raise ExceptionType("Error messages/arguments tuple")

例如,计算除法时,除数为1不符合功能逻辑:

def divide(x, y):    if y == 1:        raise ValueError("y == 1""wrong")    return x / ytry:    print(divide(11))except Exception as e:    print(e)# Output: ('y == 1', 'wrong')

除此外,也可以使用assert(断言)语句,其先判断某个条件是否成立,若不成立,则抛出异常及参数(参数可以是字符串、异常或没有)。此时,上例变为:

def divide(x, y):    assert y != 1, ValueError("y can not be 1")    return x / ytry:    print(divide(11))except Exception as e:    print(e)# Output: ('y == 1', 'wrong')

(3)自定义异常

前面我们提到,异常也是一种Python对象,说明其有对应的数据类。因此我们可以继承异常基类或者某个异常类的方式,自定义新的异常类型。由于这涉及到类的声明和继承等内容,此处就不展开说明。


往期回顾:

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零前端高颜值可视化图表交互,PyEcharts攻略|Part.2

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  1. CONNECT:[ UseTime:0.000403s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000604s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000327s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000785s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000573s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000543s ]
  8. SELECT * FROM `article` WHERE `id` = 485481 LIMIT 1 [ RunTime:0.000526s ]
  9. UPDATE `article` SET `lasttime` = 1777728062 WHERE `id` = 485481 [ RunTime:0.002698s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000309s ]
  11. SELECT * FROM `article` WHERE `id` < 485481 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000480s ]
  12. SELECT * FROM `article` WHERE `id` > 485481 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000438s ]
  13. SELECT * FROM `article` WHERE `id` < 485481 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006092s ]
  14. SELECT * FROM `article` WHERE `id` < 485481 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007263s ]
  15. SELECT * FROM `article` WHERE `id` < 485481 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004443s ]
0.112069s