Python exceptions

Creating Custom Exceptions in Python

Python offers a diverse range of built-in exception types like TypeError and ValueError, addressing syntax and runtime errors from language operations and built-in functionalities like file I/O. However, for unique errors within your application, creating custom exceptions in Python enhances code clarity and maintainability, enabling encapsulation of domain-specific error conditions and informative error messaging for users or developers.

Python’s else in try-except Statements

As in loops and conditionals, the else clause can be optionally added to a try-except statements as well. The else in try-except Python statements functions to execute a code block when an exception does not occur. Its purpose is to isolate only the code that is prone to causing the handled exception within the try block.

The Python Finally Clause

The Python finally clause is an option that can be added to try statement when handling exceptions. This clause allows you to define a code block that must be executed whether an exception occurs or not. It is useful for performing cleanup operations, such as closing a file.

Raising Exceptions With the Python raise Statement

In addition to handling exceptions raised by Python itself, you can also raise exceptions in your own code using the Python raise statement. This allows you to indicate that an error has occurred under certain conditions, even if it's not due to a runtime error generated by the Python system.

Exception Handling With the Python try-except Statements

Exception handling is a mechanism to manage errors that arise during program execution, commonly referred to as runtime errors. Such errors, for example, can be file I/O operations, network requests, or mathematical calculations. In Python, try-except statements are employed to specify where you anticipate the errors to occur and how to handle them.