Exceptionis as a sort of structured "super go to". 异常是一种结构化的"超级goto". 作为一个数十年如一日地钟爱C语言的程序员(因为C程序员需要记忆的关键字很少,而且可以很惬意地玩内存),对于高级语言如Python里的异常(Exception)一直不甚理解,尤其是其实现机理。但读了《Learning Python》一
try... 捕获异常 这个可以类比 C++ 中的try ... catch,不过 Python 异常更灵活一点(因为解释性甚至连 C++ 中一些引发编译错误 (Compile Error, CE) 的内容都能补救回来) 平凡的处理方法是try ... except: try:代码except错误类型Aas接受错误信息的变量A:处理代码Aexcept错误类型Bas接受错误信息的变量B:处理代...
>>> class Bad(Exception): #user-defined exception ... pass...>>> defdoomed(): ...raise Bad() #raise an instance ...>>> try: ... doomed() ...except Bad: #catch class name ... print "got Bad"... got Bad>>> 3.5 终止行为 (Termination Actions) Finally, try statements can ...
ZeroDivisionError)as e:...print(f"Error {type(e)}: {e}")...>>>#Usethe function>>>divide_six("six")Error:invalid literalforint()withbase10:'six'>>>divide_six(0)Error:division by zero
except ExceptionTypease:# 处理ExceptionType异常的代码,并访问异常对象e 在except块中,您还可以使用raise语句重新引发异常。例如,如果您在except块中处理了一个异常,但是您认为这个异常无法完全处理,您可以使用raise语句重新引发该异常。例如:: 代码语言:javascript ...
自从将所有的异常设计为都继承这个顶级的 Exception类,这个类可以很方便的用于捕获所有异常: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 try:do_something()except Exception:# THis will catch any exception!print("Something terrible happened") ...
drawImage("C:\Sample\bad.png", 150, 600) } catch { write "Error: ", $zerror, ! } Error: <THROW> *%Exception.PythonException <THROW> 230 ^^0^DO canvas.drawImage("W:\Sample\isc.png", 150, 600) <class 'OSError'>: Cannot open resource "W:\Sample\isc.png" -...
The except clause of your handler again contains a tuple of exceptions that you want to catch. You reference the exception, as before, by a variable named error. First, your handler prints the name of the exception class, regardless of the exception raised. Then, you use the match block ...
>>> test() catch exception! Traceback (most recent call last): raise Exception("error!") Exception: error! 如果需要,可⽤用 sys.exc_info() 获取调⽤用堆栈上的最后异常信息. >>> def test(): ... try: ... raise KeyError("key error!") ... except: ... exc_type, exc_value, ...
As a Python developer you can choose to throw an exception if a condition occurs. To throw (or raise) an exception, use theraisekeyword. Example Raise an error and stop the program if x is lower than 0: x = -1 ifx <0: raiseException("Sorry, no numbers below zero") ...