“在我们写Python脚本的时候,总是会幻想着一步到位,代码如丝滑般流畅运行,这就需要我们预先考虑各种场景,然后对可能会出现的问题进行预先处理,而识别与处理各类问题(异常),常用的就是标题所说的——Try,Except,and Assert。本文针对这三个关键词,举了一系列的栗子,可以具体来看看。 The dream of every software ...
# 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...
except: print("An exception occurred") Try it Yourself » Since the try block raises an error, the except block will be executed. Without the try block, the program will crash and raise an error: Example This statement will raise an error, becausexis not defined: ...
Raised when one of the built-in functions (input()orraw_input())hits an end-of-file condition (EOF) without reading any data. (N.B.: thefile.read()andfile.readline()methods return an empty stringwhen they hit EOF.) exception IOError Raised when an I/O operation (such as aprintsta...
We can try to run some line(s) of indented code and catch an exception or error with the except statement, such as TypeError or IndexError, and have our program executing other logic instead of crashing. Using these correctly will enhance the stability of our program. However, improper usage...
Python3 try-except、raise和assert解析 一、说明 关于异常捕获try-except:在学java的时候就被教育异常捕获也是java相对c的一大优点,几年下来多少也写了些代码,但异常捕获总只得其形未得其神,在自己这只是让发生错误的程序在不必要终止时不终止而已。 关于主动抛出
try...except...的基本格式为 try:# statement1except:# statement2 该语法效果为, 先尝试执行try管辖的statement1代码,如果遇到异常,则停止。 去执行except管辖的statement2代码。 从中文上讲,except可以理解为捕获(异常)的意思。 有时候我们需要知道具体发生了什么异常,将异常输出或者做其他使用的时候, ...
except ValueError as e: print(f"Error: {e}") Theraisestatement creates aValueErrorfor negative ages. This propagates the error to be caught in the enclosingtry-exceptblock. Nested Try Blocks Handle exceptions at different levels using nestedtrystatements. ...
使用try...except语句可以使您的代码更健壮，可以在运行时捕获并处理这些异常，避免程序崩溃或产生不良...
case statement in the past. Instead, there are some functions, like copy.replace() and glob.translate() that will only be available for you on Python 3.13. If you work on an application where you can control the running environment, you can use Python 3.13 features as soon as you’ve ...