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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def validate(self, value, validator):
 """Validates and returns the value. If the value does not validate against the schema, SchemaValidationError will be raised. :param value: A value to validate (usually a dict). :param validator: An instance of a jsonschema validator class, as created by Schema.get_validator(). :returns: the passed value. :raises SchemaValidationError: :raises Exception: """

        try:
            validator.validate(value)
        except Exception as e:
            logging.debug(e, exc_info=e)
            if isinstance(e, DoctorError):
                raise
            else:
                # Gather all the validation errors
                validation_errors = sorted(
                    validator.iter_errors(value), key=lambda e: e.path)
                errors = {}
                for error in validation_errors:
                    try:
                        key = error.path[0]
                    except IndexError:
                        key = '_other'
                    errors[key] = error.args[0]
                raise SchemaValidationError(e.args[0], errors=errors)
        return value