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Custom exceptions in Python allow developers to define specific error types that are meaningful to their application. These exceptions enhance clarity, enable fine-grained error handling, and improve code reusability. They are created by subclassing the built-in Exception class or its derivatives.
Defining a Custom Exception
To define a custom exception, create a new class that inherits from Exception. You can add attributes and methods to provide additional context or functionality.
class MyCustomError(Exception):"""Custom exception for specific error scenarios."""def __init__(self, message, error_code=None):super().__init__(message)self.error_code = error_codedef __str__(self):return f"{self.args[0]} (Error Code: {self.error_code})"Gekopieerd.✕KopiërenIn this example:
MyCustomError inherits from Exception.
The __init__ method initializes the error message and an optional error code.
The __str__ method customizes the string representation of the exception.
Raising a Custom Exception
How do I declare custom exceptions in modern Python?
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Define Custom Exceptions in Python - GeeksforGeeks
23 jul. 2025 · To define a custom exception we create a new class that inherits from the built-in 'Exception' class and override its methods to customize its behavior for specificity.
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