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Python之异常

  • 2026-08-18 23:11:49
Python之异常

1、定义

异常(Exception)是程序执行过程中发生的错误或意外情况,可能导致程序终止。

  • 错误类型

  • 语法错误(SyntaxError):代码不符合Python语法规则(如拼写错误、缺少冒号等)。

  • 运行时错误(RuntimeError):程序运行时因逻辑或外部环境导致的错误(如除零、文件不存在等)。

2、异常的作用

  • 避免程序崩溃,提供错误处理和恢复的机会。
  • 通过 try-except 结构捕获并处理异常。

3、分类

3.1、内置异常(Built-in Exceptions)

Python提供了大量内置异常类,常见类型如下:

3.2、自定义异常

通过继承 Exception 或其子类创建自定义异常。

4、捕获异常

try --- except---else --- finally在程序运行过程中,不能因为遇到某些小异常就让整个程序彻底崩溃。 应该假设某处会出现异常,提前做好准备,当真的出现异常时可以处理异常。

4.1、捕获指定异常

使用 try 和 except 关键字可以捕获并处理异常,在 except 中可以指定要捕获的异常类型。基本语法如下

class TestDemo(object): def fun(a, b): try:# 可能引发异常的代码块 return a / b# 防止 b = 0  except ZeroDivisionError as e:# 捕获除数为0的异常# 处理对应的异常 handler_exception(e)

try: 可能引发异常的代码块。except: 指定要捕获的异常类型,并处理该异常。如果代码的异常类型和要捕获的异常类型不一致,则无法捕获异常。as e 允许将异常实例赋值给变量e,以便在异常处理代码中使用。

4.2、捕获多个异常

class TestDemo(object): def fun(a, b): try:# 可能引发异常的代码块 print(d) return a / b except (ZeroDivisionError, AttributeError) as e: # 处理对应的异常 handler_exception(e)

4.3、捕获全部异常

当不知道代码块会出现哪些异常,总会有意外的出现,就是用通用的异常 Exception, 这样可以捕捉到隐藏的异常问题。使用 except 或 except Exception as e 可以捕获所有内建异常(不包括SystemExit、KeyboardInterrupt和GeneratorExit),但不包括从BaseException直接继承的其他异常。

class TestDemo(object): def fun(a, b): try:# 可能引发异常的代码块 return a / b except Exception as e: # 处理对应的异常 handler_exception(e)

4.4、捕获未知异常

使用 except BaseException as e 可以捕获所有异常,包括那些从 BaseException 直接继承的异常。

class TestDemo(object): def fun(a, b): try:# 可能引发异常的代码块 return a / b except BaseException as e: # 处理对应的异常 handler_exception(e)

5、else 和 finally 的使用

5.1、else 子句

若try 中没有发生异常,那么可继续执行 else 中的代码块

class TestDemo(object): def fun(a): try:# 可能引发异常的代码块 return a except BaseException as e: # 处理对应的异常 handler_exception(e) else: print(”程序未发生异常,可以执行else代码块”)

5.2、finally 子句

无论是否会发生异常,finally代码块都会被执行,一般用于释放资源(关闭连接,文档等)。

class TestDemo(object): def fun(a): try:# 可能引发异常的代码块 return a except BaseException as e: # 处理对应的异常 handler_exception(e) else: print(”程序未发生异常,可以执行else代码块”) finally: print(”最终关闭所有资源”)

6、自定义异常

在开发项目中可以根据自己的需求,自定义一些异常,在发生对应的问题后,捕获异常。可以通过继承 Exception 类来实现该功能。

class MyApiException(Exception): def __init__(self, code, message): super().__init__(message) self.error_code = codeclass TestDemo(object): def fun(): try: raise MyApiException(500, ”用户名或密码错误!!!”) except: MyApiException as e : print(f”fail: code:{e.code}, conext: {e}”)

7、raise 手动触发异常

raise 关键字可以手动触发异常

class TestDemo(object): def fun(): if 1 < 0 : raise Exception(”数据错误”)

7、异常传递

在try 代码块中发生了异常,但是没有 except 捕获异常,那么异常会逐层向上传递,直到有except捕获的地方,或者没有处理程序崩溃了才会停止。

class TestDemo(): def fun1(a, b): return a / b def fun2(): try: fun1(1,0) except ZeroDivisionError as e: print(”除数不可以为0”)fun2()

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  1. CONNECT:[ UseTime:0.001079s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001503s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010947s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007284s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001457s ]
  6. SELECT * FROM `set` [ RunTime:0.013982s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001525s ]
  8. SELECT * FROM `article` WHERE `id` = 509400 LIMIT 1 [ RunTime:0.017594s ]
  9. UPDATE `article` SET `lasttime` = 1787294461 WHERE `id` = 509400 [ RunTime:0.031647s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001007s ]
  11. SELECT * FROM `article` WHERE `id` < 509400 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002517s ]
  12. SELECT * FROM `article` WHERE `id` > 509400 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001199s ]
  13. SELECT * FROM `article` WHERE `id` < 509400 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026429s ]
  14. SELECT * FROM `article` WHERE `id` < 509400 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.064641s ]
  15. SELECT * FROM `article` WHERE `id` < 509400 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006631s ]
0.364928s