# 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 that braces () are necessary here for# multiple exceptionsexceptZer...
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...
handle it, a simpler form of the :keyword:`raise` statement allows you to re-raise the exception: 如果你需要明确一个异常是否抛出,但不想处理它, :keyword:`raise` 语句可以让你很简单的重新抛出该异常。 >>> try: ... raise NameError('HiThere') ... except NameError: ... print 'An excep...
This technique is pretty handy when you’re processing a piece of code that can raise multiple types of exceptions. Consider the following divide() function: Python >>> def divide(x, y): ... for arg in (x, y): ... if not isinstance(arg, int | float): ... raise TypeError...
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 InputThis example raises a ValueError if the function calculate_square_root receives a negative ...
...except(KeyboardInterupt, SystemExit):#user wants to quitraiseexceptException:#handle real errors 或者是: try: ...exceptBaseException, e:#handle all errors 注意,一个不正确的使用方法就是把一大段程序放入一个 try 块中, 再用一个通用的except 语句“过滤”掉任何致命的错误并忽略它们: #this is...
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...
异常链传递指的是当一个异常捕获并处理后,可以选择重新引发(re-raise)同一个异常或者另一个异常,并且保留原始异常的信息。 这种做法可以保留异常的上下文信息,使得调试和排查问题更加方便。 在Python中,可以通过在异常处理程序中使用raise ... from语句来实现异常链的传递。例如,可以在捕获到某个异常后,重新引发同一...
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...
try:try:raiseValueError("a")except*TypeError:...exceptValueErrorase:print(repr(e))# ValueError("a") 注意: 不能在同一 `try` 语句 中混用 `except` 和 `except*`: try:...exceptException:...except*Exception:# <- SyntaxError... P.S. 在本文撰写时,作者还向 CPython 提交了建议优化这种情况的...