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Python 异常处理 try...except...finally

  • 2026-02-19 23:05:31
Python 异常处理 try...except...finally
Python处理异常的语法结构:
try:print("1. try执行了")    result = 10 / 0  # 除零错误except ZeroDivisionError:print("2. except执行了(捕获到异常)")else:print("3. else不会执行(因为有异常)")finally:print("4. finally总会执行")# 输出:# 1. try执行了# 2. except执行了(捕获到异常)# 4. finally总会执行
try...except...else...finally流程图:
try...except...else...finally和if...else...区别:
  • if else
    提前预判:就像出门前看天气预报,如果下雨(条件为真)就带伞,否则不带。它处理的是可预见的、能提前判断的逻辑分支
  • try except
    事后容错:就像出门没看天气预报,下雨了(发生异常)就临时找避雨的地方,没下雨就正常走。它处理的是无法提前预判(或预判成本极高)的意外情况
except 后面必须是异常类:

Python 中的所有异常本质上都是类(Class)except 关键字后面必须跟这个类(或它的实例),而不是普通的字符串 / 变量名:

  • 内置异常(如 ValueErrorZeroDivisionError)是 Python 预定义的异常类,所以可以直接用;
  • 自定义异常需要你先定义一个继承自 Exception 的类,才能在 except 中使用。
内置异常:

所有的错误类型都继承自 BaseException

BaseException ├── BaseExceptionGroup ├── GeneratorExit ├── KeyboardInterrupt ├── SystemExit └── Exception      ├── ArithmeticError      │    ├── FloatingPointError      │    ├── OverflowError      │    └── ZeroDivisionError      ├── AssertionError      ├── AttributeError      ├── BufferError      ├── EOFError      ├── ExceptionGroup [BaseExceptionGroup]      ├── ImportError      │    └── ModuleNotFoundError      ├── LookupError      │    ├── IndexError      │    └── KeyError      ├── MemoryError      ├── NameError      │    └── UnboundLocalError      ├── OSError      │    ├── BlockingIOError      │    ├── ChildProcessError      │    ├── ConnectionError      │    │    ├── BrokenPipeError      │    │    ├── ConnectionAbortedError      │    │    ├── ConnectionRefusedError      │    │    └── ConnectionResetError      │    ├── FileExistsError      │    ├── FileNotFoundError      │    ├── InterruptedError      │    ├── IsADirectoryError      │    ├── NotADirectoryError      │    ├── PermissionError      │    ├── ProcessLookupError      │    └── TimeoutError      ├── ReferenceError      ├── RuntimeError      │    ├── NotImplementedError      │    ├── PythonFinalizationError      │    └── RecursionError      ├── StopAsyncIteration      ├── StopIteration      ├── SyntaxError      │    └── IndentationError      │         └── TabError      ├── SystemError      ├── TypeError      ├── ValueError      │    └── UnicodeError      │         ├── UnicodeDecodeError      │         ├── UnicodeEncodeError      │         └── UnicodeTranslateError      └── Warning           ├── BytesWarning           ├── DeprecationWarning           ├── EncodingWarning           ├── FutureWarning           ├── ImportWarning           ├── PendingDeprecationWarning           ├── ResourceWarning           ├── RuntimeWarning           ├── SyntaxWarning           ├── UnicodeWarning           └── UserWarning
假如需要输入一个有效的数字,程序才能执行,因该怎么写?
while True:    try:        num = int(input("请输入一个除数:"))        result = 10 / numprint(f"结果是:{result}")break# 没有异常才跳出循环    except ZeroDivisionError:print("除数不能为0,请重新输入!")    except ValueError:print("请输入有效的整数!")

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  1. CONNECT:[ UseTime:0.000413s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000827s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000701s ]
  6. SELECT * FROM `set` [ RunTime:0.000255s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000701s ]
  8. SELECT * FROM `article` WHERE `id` = 475215 LIMIT 1 [ RunTime:0.000492s ]
  9. UPDATE `article` SET `lasttime` = 1771689864 WHERE `id` = 475215 [ RunTime:0.022167s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000345s ]
  11. SELECT * FROM `article` WHERE `id` < 475215 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000591s ]
  12. SELECT * FROM `article` WHERE `id` > 475215 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000434s ]
  13. SELECT * FROM `article` WHERE `id` < 475215 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005117s ]
  14. SELECT * FROM `article` WHERE `id` < 475215 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006815s ]
  15. SELECT * FROM `article` WHERE `id` < 475215 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004388s ]
0.115333s