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影响。
自动包含try和except的with语句是Python编程语言中的一种语法结构,用于简化资源管理和异常处理的过程。它的定义如下: with语句是一种上下文管理器,用于自动管理资源的分配和释放。它的...
try: f = open("file", "r") try: line = f.readline() finally: f.close() except IOError: <whatever> 正如你所看到的,with语句可以使事情变得更少出错。在较新版本的Python(2.7,3.1)中,你也可以在一个 with 语句中组合多个表达式。例如: with open("input", "r") as inp, open("output",...
# 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管辖的代码会运行。 语法 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。
In the above example, use the with statement to open the file in read mode, and perform some operation with the file inside the with block. If any of the specified exceptions occur during this operation, the corresponding except block is executed....
The try-except statement is a Microsoft extension to the C language that enables applications to gain control of a program when events that normally terminate execution occur. Such events are called exceptions, and the mechanism that deals with exceptions is called structured exception handling....
Thetry-exceptstatement is a Microsoft extension to the C language that enables applications to gain control of a program when events that normally terminate execution occur. Such events are called exceptions, and the mechanism that deals with exceptions is called structured exception handling. ...
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: ...
The try-except statement is a Microsoft extension to the C language that enables applications to gain control of a program when events that normally terminate execution occur. Such events are called exceptions, and the mechanism that deals with exceptions is called structured exception handling....