@validates('email')
def validate_email(self, key, email):
    if (not Person.is_valid_email(email)):
        message = 'Must provide a valid email address'
        raise ValidationError(message)
    return email
@validates('email')
def validate_email(self, key, email):
    if (not Person.is_valid_email(email)):
        message = 'Must provide a valid email address'
        raise ValidationError(message)
    return email