error-suffix-on-exception-name (N818)

Derived from the pep8-naming linter.

What it does

Checks for custom exception definitions that omit the Error suffix.

Why is this bad?

The Error suffix is recommended by PEP 8:

Because exceptions should be classes, the class naming convention applies here. However, you should use the suffix "Error" on your exception names (if the exception actually is an error).

Example

class Validation(Exception): ...

Use instead:

class ValidationError(Exception): ...