four classes namedException,SystemExit,KeyboardInterrupt andGeneratorExit are derived. All the remaining built-in exception classes are derived directly or indirectly from theException class.The figure shows some of the classes derived fromException class; there are many other classes also. ...
Built-in ExceptionsThe table below shows built-in exceptions that are usually raised in Python:ExceptionDescription ArithmeticError Raised when an error occurs in numeric calculations AssertionError Raised when an assert statement fails AttributeError Raised when attribute reference or assignment fails ...
内建异常(Built-in Exceptions):由Python内部定义的异常,例如ZeroDivisionError、NameError等。 用户自定义异常:由程序员自己定义的异常,用于满足特定的业务需求。 【1】BaseException(所有异常的基类) SystemExit:解释器请求退出 KeyboardInterrupt:用户中断执行(通常是输入^C) Exception:常规错误的基类 StopIteration:迭代器...
Python:built-in exceptions Exception hierarchy¶ The class hierarchy for built-in exceptions is: BaseException +-- SystemExit +-- KeyboardInterrupt +-- GeneratorExit +-- Exception +-- StopIteration +-- StopAsyncIteration +-- ArithmeticError | +-- FloatingPointError | +-- Overfl...
Built-in Exceptions 列出的内建的异常及其含义。 异常捕获语句: try: # do something except ValueError: # handle ValueError exception except (IndexError, ZeroDivisionError): # handle multiple exceptions # IndexError and ZeroDivisionError except: # handle all other exceptions finally: # cleanup resources ...
print(e)3、Else in Try-Except 如果没有引发异常,则try-except块中的else子句将运行。这是其他语言没有的 try: # Attempt operation except Exception: # Handle error else: # Executes if no exceptions4、AS关键字 在捕获异常时,可以使用as关键字将异常分配给一个变量,这样可以显示详细信息并使调试更容易。
) # Exception: 4 should not be in the expression. 2.4 assert 语句 通过if 语句进行判断,满足条件则触发异常,执行 raise 语句。 if '4' in expression: raise Exception("4 should not be in the expression.") Python 中有 assert 关键词,用它构造一个语句,能够免去 if 和 raise 语句。 assert ('4...
An exception refers to an error or unexpected situation that occurs during the execution of a program, which interrupts the normal flow of the program. Python provides a rich set of built-in exception types, such as ZeroDivisionError, TypeError, IndexError, etc., each representing a specific ...
Python3使用try ... except [else]来捕获异常,且要求异常必须继承Exception类。所有Built-in异常都继承自这个类。 捕获异常 使用sys.exc_info 和 sys.last_traceback(包含的内容与 sys.exc_info() 相同,但它主要用于调试)可获取异常的详细信息,会返回一个3值元表(type, value, traceback) ,其中: ...
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") ...