How to use the cerberus.errors.ErrorList function in Cerberus

def __validate_logical(self, operator, definitions, field, value):
        """ Validates value against all definitions and logs errors according
            to the operator. """
        valid_counter = 0
        _errors = errors.ErrorList()

        for i, definition in enumerate(definitions):
            schema = {field: definition.copy()}
            for rule in ('allow_unknown', 'type'):
                if rule not in schema[field] and rule in self.schema[field]:
                    schema[field][rule] = self.schema[field][rule]
            if 'allow_unknown' not in schema[field]:
                schema[field]['allow_unknown'] = self.allow_unknown

            validator = self._get_child_validator(
                schema_crumb=(field, operator, i), schema=schema, allow_unknown=True
            )
            if validator(self.document, update=self.update, normalize=False):
                valid_counter += 1
            else:
                self._drop_nodes_from_errorpaths(validator._errors, [], [3])

def fetch_errors_from(self, path: DocumentPath) -> ErrorList:
        """ Returns all errors for a particular path. """
        node = self.fetch_node_from(path)
        if node is None:
            return ErrorList()
        else:
            return node.errors

def __validate_logical(self, operator, definitions, field, value):
        """ Validates value against all definitions and logs errors according
            to the operator. """
        valid_counter = 0
        _errors = errors.ErrorList()

        for i, definition in enumerate(definitions):
            schema = {field: definition.copy()}
            for rule in ('allow_unknown', 'type'):
                if rule not in schema[field] and rule in self.schema[field]:
                    schema[field][rule] = self.schema[field][rule]
            if 'allow_unknown' not in schema[field]:
                schema[field]['allow_unknown'] = self.allow_unknown

            validator = self._get_child_validator(
                schema_crumb=(field, operator, i), schema=schema, allow_unknown=True
            )
            if validator(self.document, update=self.update, normalize=False):
                valid_counter += 1
            else:
                self._drop_nodes_from_errorpaths(validator._errors, [], [3])

def __init_processing(self, document, schema=None):
        self._errors = errors.ErrorList()
        self.recent_error = None
        self.document_error_tree = errors.DocumentErrorTree()
        self.schema_error_tree = errors.SchemaErrorTree()
        self.document = copy(document)
        if not self.is_child:
            self._is_normalized = False

        if schema is not None:
            self.schema = DefinitionSchema(self, schema)
        elif self.schema is None:
            if isinstance(self.allow_unknown, Mapping):
                self._schema = {}
            else:
                raise SchemaError(errors.SCHEMA_ERROR_MISSING)
        if document is None:
            raise DocumentError(errors.DOCUMENT_MISSING)

def _validate_anyof(self, definitions, field, value):
        """ {'type': 'list', 'logical': 'anyof'} """

        if 'role' not in list(definitions[0]['schema'].keys()):
            return super(AnyofValidator, self)._validate_anyof(definitions,
                                                               field, value)

        valids = 0
        found_valid_role = False
        _errors = errors.ErrorList()
        valid_roles = []
        for i, definition in enumerate(definitions):
            valid_roles.extend(definition['schema']['role']['allowed'])
            if value['role'] not in definition['schema']['role']['allowed']:
                continue

            found_valid_role = True

            schema = {field: definition.copy()}
            for rule in ('allow_unknown', 'type'):
                if rule not in schema[field] and rule in self.schema[field]:
                    schema[field][rule] = self.schema[field][rule]
            if 'allow_unknown' not in schema[field]:
                schema[field]['allow_unknown'] = self.allow_unknown

            validator = self._get_child_validator(

def __init_processing(self, document, schema=None):
        self._errors = errors.ErrorList()
        self.recent_error = None
        self.document_error_tree = errors.DocumentErrorTree()
        self.schema_error_tree = errors.SchemaErrorTree()
        self.document = copy(document)
        if not self.is_child:
            self._is_normalized = False

        self.__init_schema(schema)

        if self.schema is None:
            if isinstance(self.allow_unknown, Mapping):
                self.schema = {}
            else:
                raise SchemaError(errors.MISSING_SCHEMA)

        if document is None:

def __init__(self, *args, **kwargs):
        """ The arguments will be treated as with this signature:

        __init__(self, schema=None, ignore_none_values=False,
                 allow_unknown=False, require_all=False,
                 purge_unknown=False, purge_readonly=False,
                 error_handler=errors.BasicErrorHandler)
        """

        self.document = None
        """ The document that is or was recently processed.
            Type: any :term:`mapping` """
        self._errors = errors.ErrorList()
        """ The list of errors that were encountered since the last document
            processing was invoked.
            Type: :class:`~cerberus.errors.ErrorList` """
        self.recent_error = None
        """ The last individual error that was submitted.
            Type: :class:`~cerberus.errors.ValidationError` """
        self.document_error_tree = errors.DocumentErrorTree()
        """ A tree representiation of encountered errors following the
            structure of the document.
            Type: :class:`~cerberus.errors.DocumentErrorTree` """
        self.schema_error_tree = errors.SchemaErrorTree()
        """ A tree representiation of encountered errors following the
            structure of the schema.
            Type: :class:`~cerberus.errors.SchemaErrorTree` """
        self.document_path = ()
        """ The path within the document to the current sub-document.