# Program to handle multiple errors with one# except statement# Python 3deffun(a):ifa<4:# throws ZeroDivisionError for a = 3b=a/(a-3)# throws NameError if a >= 4print("Value of b = ",b)try:fun(3)fun(5)# note tha
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]]] 以下实例如果 x 大于 5 就触发异常: x=10 ifx>5: raiseException('x 不能大于 5。x 的值为: {}'.format(x)) 执行以上代码会触发异常: Traceback(most recent calllast):File"test.py",line3,in...
Use specific errors like : ZeroDevisionError, ValueError, TypeError, etc raise Exception(f'') AssertionError Raised when the assert statement fails. AttributeError Raised on the attribute assignment or reference fails. EOFError Raised when the input() function hits the end-of-file condition. Floati...
If you try to raise multiple exceptions, the program will finish after handling the first exception. The rest will never be raised. You can show this using code similar to the following: Python # catch_first_only.py exceptions = [ZeroDivisionError(), FileNotFoundError(), NameError()] num...
creating a module that can raise several distinct errors, a common practice is to create a base class for exceptions defined by that module, and subclass that to create specific exception classes for different error conditions: 异常类中可以定义任何其它类中可以定义的东西,但是通常为了保持简单,只在 ...
Before communicating with processes, though, you’ll learn how to handle errors when coding with subprocess.subprocess ExceptionsAs you saw earlier, even if a process exits with a return code that represents failure, Python won’t raise an exception. For most use cases of the subprocess module,...
It can also be used to print an error message and then re-raise the exception (allowing a caller to handle the exception as well): try-except的最后一个except语句块可以省略异常的名字,来作为一个通配符。使用这种异常块要非常的小心,因为这种方式很容易掩盖程序真实的错误!它也能够先打印错误消息,并引...
raise: The 'raise' statement is used to trigger an exception manually. ZeroDivisionError: A built-in exception that indicates a division by zero attempt. Example 2: Raising a 'ValueError' for Invalid Input This example raises a ValueError if the function calculate_square_root receives a negative...
Handling Errors in Python Python provides a mechanism for handling errors using try-except blocks. The try block contains the code that may raise an exception, while the except block handles the exception if it occurs. try:result=10/0exceptZeroDivisionError:print("Division by zero is not allowed...
raise # reraise back to caller except Exception: # handle real errors 当你有了一个Exception处理器后,你不必为这两个异常创建额外的处理器 try: : except Exception,e: # handle real errors 如果你确实需要捕获所有异常,那么你就得使用新的BaseExcption: try: : except BaseException,e: # handle all ...