2. Exception Roles异常充当的最常见的几种角色 Error handling 错误处理 Event notification 事件通知 Special-case handling 特殊情况处理 Termination actions 行为终止 Unusual control flows 非常规控制流 3. Exceptions: The Short Story异常处理简明教程 3.1 默认异常处理器 (Default Exception Handler) 当我们的代码...
except: print('Handling other exceptions...') 上面这段代码,当输入a(非数字)时,将抛出ValueError异常;当输入0时,将抛出ZeroDivisionError异常;当抛出其他类型的异常时,将执行except:后的处理语句。 如果在 try 语句执行时,出现了一个异常,该语句的剩下部分将被跳过。并且如果该异常的类型匹配到了 except 后面的...
Thetrykeyword in Python initiates exception handling blocks to gracefully manage runtime errors. Paired withexcept,else, andfinally, it prevents program crashes by capturing and processing exceptions. This tutorial covers error handling techniques with practical examples. Exception handling allows developers ...
Handlingrun-timeerror:intdivisionormodulobyzero 用户自定义异常 #1.用户自定义异常类型,只要该类继承了Exception类即可,至于类的主题内容用户自定义,可参考官方异常类 class TooLongExceptin(Exception): "this is user's Exception for check the length of name " def __init__(self,leng): self.leng = le...
>>>defthis_fails():x=1/0>>>try:this_fails()except ZeroDivisionErroraserr:print('Handling run-time error:',err)Handling run-time error:int division or modulo by zero try-finally 语句 try-finally 语句无论是否发生异常都将执行最后的代码。
withopen('file.log')asfile: read_data=file.read() exceptFileNotFoundErrorasfnf_error: print(fnf_error) finally: print('这句话,无论异常是否发生都会执行。') 抛出异常 Python 使用 raise 语句抛出一个指定的异常。 raise语法格式如下: raise [Exception [, args [, traceback]]] ...
# Convention is to use lower_case_with_underscores some_var = 5 some_var # => 5 # Accessing a previously unassigned variable is an exception. # See Control Flow to learn more about exception handling. some_unknown_var # Raises a NameError ...
Handling run-time error: int division or modulo by zero try-finally 语句 try-finally 语句无论是否发生异常都将执行最后的代码。 以下实例中 finally 语句无论异常是否发生都会执行: 实例 try: runoob() except AssertionError as error: print(error) ...
An Example of Exception Handling Here’s a code snippet that shows the main exceptions that you’ll want to handle when using subprocess: Python import subprocess try: subprocess.run( ["python", "timer.py", "5"], timeout=10, check=True ) except FileNotFoundError as exc: print(f"...
3.7 异常处理(Exception Handling) 通常在写完代码第一次运行脚本时,我们难免会遇到一些代码错误。在Python中大致有两种代码错误:语法错误(Syntax Errors)和异常(Exceptions)。比如下面这种忘了在if语句末尾加上冒号':'的就是一种典型的语法错误。 >>> if True File "<stdin>", line 1, in ? if True ^ Synta...