How to use the tablib.packages.yaml3.constructor.ConstructorError function in tablib

def find_python_name(self, name, mark):
        if not name:
            raise ConstructorError("while constructing a Python object", mark,
                    "expected non-empty name appended to the tag", mark)
        if '.' in name:
            module_name, object_name = name.rsplit('.', 1)
        else:
            module_name = 'builtins'
            object_name = name
        try:
            __import__(module_name)
        except ImportError as exc:
            raise ConstructorError("while constructing a Python object", mark,
                    "cannot find module %r (%s)" % (module_name, exc), mark)
        module = sys.modules[module_name]
        if not hasattr(module, object_name):
            raise ConstructorError("while constructing a Python object", mark,
                    "cannot find %r in the module %r"
                    % (object_name, module.__name__), mark)

def find_python_name(self, name, mark):
        if not name:
            raise ConstructorError("while constructing a Python object", mark,
                    "expected non-empty name appended to the tag", mark)
        if '.' in name:
            module_name, object_name = name.rsplit('.', 1)
        else:
            module_name = 'builtins'
            object_name = name
        try:
            __import__(module_name)
        except ImportError as exc:
            raise ConstructorError("while constructing a Python object", mark,
                    "cannot find module %r (%s)" % (module_name, exc), mark)
        module = sys.modules[module_name]
        if not hasattr(module, object_name):
            raise ConstructorError("while constructing a Python object", mark,
                    "cannot find %r in the module %r"
                    % (object_name, module.__name__), mark)
        return getattr(module, object_name)

def construct_sequence(self, node, deep=False):
        if not isinstance(node, SequenceNode):
            raise ConstructorError(None, None,
                    "expected a sequence node, but found %s" % node.id,
                    node.start_mark)
        return [self.construct_object(child, deep=deep)
                for child in node.value]

def find_python_module(self, name, mark):
        if not name:
            raise ConstructorError("while constructing a Python module", mark,
                    "expected non-empty name appended to the tag", mark)
        try:
            __import__(name)
        except ImportError as exc:
            raise ConstructorError("while constructing a Python module", mark,
                    "cannot find module %r (%s)" % (name, exc), mark)
        return sys.modules[name]

def construct_pairs(self, node, deep=False):
        if not isinstance(node, MappingNode):
            raise ConstructorError(None, None,
                    "expected a mapping node, but found %s" % node.id,
                    node.start_mark)
        pairs = []
        for key_node, value_node in node.value:
            key = self.construct_object(key_node, deep=deep)
            value = self.construct_object(value_node, deep=deep)
            pairs.append((key, value))
        return pairs

def flatten_mapping(self, node):
        merge = []
        index = 0
        while index < len(node.value):
            key_node, value_node = node.value[index]
            if key_node.tag == 'tag:yaml.org,2002:merge':
                del node.value[index]
                if isinstance(value_node, MappingNode):
                    self.flatten_mapping(value_node)
                    merge.extend(value_node.value)
                elif isinstance(value_node, SequenceNode):
                    submerge = []
                    for subnode in value_node.value:
                        if not isinstance(subnode, MappingNode):
                            raise ConstructorError("while constructing a mapping",
                                    node.start_mark,
                                    "expected a mapping for merging, but found %s"
                                    % subnode.id, subnode.start_mark)
                        self.flatten_mapping(subnode)
                        submerge.append(subnode.value)
                    submerge.reverse()
                    for value in submerge:
                        merge.extend(value)
                else:
                    raise ConstructorError("while constructing a mapping", node.start_mark,
                            "expected a mapping or list of mappings for merging, but found %s"
                            % value_node.id, value_node.start_mark)
            elif key_node.tag == 'tag:yaml.org,2002:value':
                key_node.tag = 'tag:yaml.org,2002:str'
                index += 1
            else:

def construct_object(self, node, deep=False):
        if deep:
            old_deep = self.deep_construct
            self.deep_construct = True
        if node in self.constructed_objects:
            return self.constructed_objects[node]
        if node in self.recursive_objects:
            raise ConstructorError(None, None,
                    "found unconstructable recursive node", node.start_mark)
        self.recursive_objects[node] = None
        constructor = None
        tag_suffix = None
        if node.tag in self.yaml_constructors:
            constructor = self.yaml_constructors[node.tag]
        else:
            for tag_prefix in self.yaml_multi_constructors:
                if node.tag.startswith(tag_prefix):
                    tag_suffix = node.tag[len(tag_prefix):]
                    constructor = self.yaml_multi_constructors[tag_prefix]
                    break
            else:
                if None in self.yaml_multi_constructors:
                    tag_suffix = node.tag
                    constructor = self.yaml_multi_constructors[None]