Throw multiple validation errors

multiple_exceptions.py

# based on http://stackoverflow.com/questions/6470428/catch-multiple-exceptions-in-one-line-except-block

class ValidationError(Exception):
    pass


class ValidationErrors(ValidationError):
    def __str__(self):
        return ' '.join(str(e) for e in self.args[0])


e1 = ValidationError('Error 1.')
e2 = ValidationError('Error 2.')
errors = [e1, e2]
raise ValidationErrors(errors)
# Run and see "Error 1. Error 2." as error message