• Use a good representation name
• Do not use underscore to separate
• Use camel case
• Do not use special symbols
• Do not use letters to represent the type like "E" for Error
• Use the 'Error' suffix in the exception class name
• Extends the Exception class or subclass
• Never extend the "BaseException" class. Use it for an specific situation only

✅ Do

class ValidationError(Exception):
    ...

❌ Don't

class ValidationException(Exception):
    ...

class EValidation(Exception):
    ...