What does it mean for an exception to be thrown?
In programming, an exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions. When an exception occurs, the program transfers control to a special exception handler, which is responsible for dealing with the exception and, if possible, allowing the program to continue execution.
There are various types of exceptions, such as:
- SyntaxError: An error in the code syntax.
- TypeError: An error involving the type of a value or variable.
- ValueError: An error involving the value of a variable.
- IndexError: An error involving accessing an invalid index.
- KeyError: An error involving accessing a non-existent key in a dictionary.
The specific behavior of a program when an exception is thrown depends on the programming language and the exception type. In some languages, exceptions are automatically propagated up the call stack until they are caught and handled by an exception handler. In other languages, exceptions need to be explicitly caught and handled using keywords like try, catch, and finally.
It's important to handle exceptions properly to prevent unexpected program behavior, such as crashes or incorrect results. Exception handling allows you to log error messages, recover from errors gracefully, and provide helpful feedback to users if possible.
Related Questions
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tryandexceptkeywords in Python? - How can I create my own custom exception class?
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