在python程序运行时出现的异常大多是继承自Exception类。在python中不管是什么类的异常都继承自超类(基类/父类)BaseException。BaseException派生出了4个之类:用户中断执行时异常(keyboardinterrupt),python解释器退出异常(systemexit),内置及非系统退出异常(exception),生成器退出异常(generatorexit)。但是一般来说我们在编写...
We print the error message if a FahrenheitError is raised. Otherwise, we display the temperature in Celsius after conversion. Conclusion :-As a result, we have successfully learned how to raise custom exceptions with an example.To create a unique exception class, subclass the Exception class or...
try:#1/0 # 执行except ZeroDivisionError 部分#raise Exception("手动触发异常") # 执行 except Exception部分pass#占位 不会执行任何程序 执行else部分#异常时输出exceptZeroDivisionError as ze:print("异常时输出:", ze)#其他异常时输出exceptException as ex:print("其他异常时输出:", ex)#没有异常时输出else:...
# Custom exception classclassMyCustomException(Exception):pass# Raise custom exceptiondefmy_function(arg):ifarg<0:raiseMyCustomException("Argument must be non-negative")returnarg*2 Now use this Custom exception class to manually throw an exception: ...
self.message = message super().__init__(message) try: raise CustomError("发生了一个定制的错误!") except CustomError as e: print(e) # 输出:发生了一个定制的错误! class UserNotFoundException(CustomError): pass try: raise UserNotFoundException("指定用户未找到!") ...
raise [exceptionName [(reason)]] 1. 其中,用 [] 括起来的为可选参数,其作用是指定抛出的异常名称,以及异常信息的相关描述。如果可选参数全部省略,则 raise 会把当前错误原样抛出;如果仅省略 (reason),则在抛出异常时,将不附带任何的异常描述信息。
Custom Exceptions in Python By: Rajesh P.S.Exceptions in Python are events that occur during the execution of a program that disrupt the normal flow of the program's instructions. When an exception occurs, the program will stop executing and instead raise an error message that describes the ...
except Exception as e: print(f'error is {str(e)}') pass # 2 - better import traceback try: func(data) except Exception: self.output("raise exception, stop backtesting") # self.output(traceback.format_exc()) self.output(traceback.print_exc()) ...
class CustomError(Exception): """自定义异常类""" def __init__(self, message): self.message = message try: raise CustomError("这是一个自定义异常") except CustomError as e: print(f"捕获到自定义异常:{e.message}") 在这个示例中,我们定义了一个 CustomError 异常类,并在 try 块中引发这个...
raise SalaryNotInRangeError(salary) __main__.SalaryNotInRangeError: Salary is not in (5000, 15000) range Here, we have overridden the constructor of theExceptionclass to accept our own custom argumentssalaryandmessage. Then, the constructor of the parentExceptionclass is called manually with the...