How to declare custom exceptions in modern Python?

To declare a simple custom exception we can have a script like this

class MyException(Exception):
    pass

But how do I declare a custom exception to override something or to pass extra arguments to the exception?

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1 Answer

Rajendra Dharmkar

Answered on 6th Dec, 2017

To override something or pass extra arguments to the exception we do like this in modern python:

class ValidationError(Exception):
def __init__(self, message, errors):
super(ValidationError, self).__init__(message)
self.errors = errors

That way we could pass dictionary of error messages to the second parameter, and get to it later on when needed.

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