#!/usr/bin/env python3 def main(): x = int('str') print(x) if __name__ == '__main__': main() 运行结果为: Traceback (most recent call last): File " Exception.py", line 7, in <module> if __name__ == '__main__': main()
Here, theassertstatement in the code checks thatnumis an even number; if num is odd, it raises anAssertionError, triggering the except block. Note: Exceptions in theelseclause are not handled by the preceding except clauses. Python try...finally In Python, thefinallyblock is always executed ...
以一个名为Exception.py的文件为例，以下是运行结果：Traceback (most recent call last): File "Exception.py", line 7, in if __name__ == '__main__': main() File "Exception.py", line 4, in main x = int('str') ValueError: invalid literal for int() with base 10: 'st...
c = ((a+b) / (a-b))exceptZeroDivisionError:print("a/b result in 0")else:print(c) Finally Python提供了一个关键字finally,它总是在try和except块之后执行。finally块总是在try块正常终止后或try块由于某些异常终止后执行。 try:# Some Code...except:# optional block# Handling of exception (if ...
Python Exception Handling Python中的错误可以有两种类型,即error和exception。error是程序中的问题,程序会因此停止执行。另一方面,当某些内部事件发生时,会引发异常,从而改变程序的正常流程。 error 顾名思义,代码中引发的错误。例如语法错误,导致程序终止。
If there is ExceptionI, then execute this block. except ExceptionII: If there is ExceptionII, then execute this block. ... else: If there is no exception then execute this block. #The except Clause with No Exceptions try: You do your operations here; ... except: If there is any ex...
Python 有两种错误很容易辨认:语法错误和异常。 Python assert(断言)用于判断一个表达式,在表达式条件为 false 的时候触发异常。 语法错误 Python 的语法错误或者称之为解析错,是初学者经常碰到的,如下实例 >>>whileTrueprint('Hello world') File"<stdin>",line1,in?
从上贴【错误类型】的内容我们知道,Python 在程序报错时会返回详细信息,如错误发生的行数和具体的错误类型。 首先需要明白的是,我们无法完全阻止错误发生,但是可以提前预防以至于程序不会崩溃。这个提前预防的动作称为异常处理(exception handling)。 总之异常处理就是为了防患于未然。
Please enter a positive number: -10 You entered -10, which is not a positive number. Please enter a positive number: abc Traceback (most recent call last): File "/Users/pankaj/Documents/PycharmProjects/hello-world/journaldev/errors/valueerror_examples.py", line 11, in <module> ...
handling of the above exception, another exception occurred:Traceback (most recent call last ): File "/Users/chenxiangan/pythonproject/demo/greetings.py", line 17, in <module> greet_many (['Chad', 'Dan', 1]) File "/Users/chenxiangan/pythonproject/demo/greetings.py", line 14, in greet...