How to use the astroid.bases.BoundMethod function in astroid

def function_to_method(n, klass):
    if isinstance(n, FunctionDef):
        if n.type == 'classmethod':
            return bases.BoundMethod(n, klass)
        if n.type != 'staticmethod':
            return bases.UnboundMethod(n)
    return n

def class_instance_as_index(node):
    """Get the value as an index for the given instance.

    If an instance provides an __index__ method, then it can
    be used in some scenarios where an integer is expected,
    for instance when multiplying or subscripting a list.
    """
    context = contextmod.InferenceContext()
    context.callcontext = contextmod.CallContext(args=[node])

    try:
        for inferred in node.igetattr("__index__", context=context):
            if not isinstance(inferred, bases.BoundMethod):
                continue

            for result in inferred.infer_call_result(node, context=context):
                if isinstance(result, nodes.Const) and isinstance(result.value, int):
                    return result
    except exceptions.InferenceError:
        pass
    return None

def _wrap_attr(self, attrs, context=contextmod.global_context):
        """wrap bound methods of attrs in a InstanceMethod proxies"""
        for attr in attrs:
            if isinstance(attr, UnboundMethod):
                if _is_property(attr):
                    yield from attr.infer_call_result(self, context)
                else:
                    yield BoundMethod(attr, self)
            elif hasattr(attr, "name") and attr.name == "":
                # This is a lambda function defined at class level,
                # since its scope is the underlying _proxied class.
                # Unfortunately, we can't do an isinstance check here,
                # because of the circular dependency between astroid.bases
                # and astroid.scoped_nodes.
                if attr.statement().scope() == self._proxied:
                    if attr.args.args and attr.args.args[0].name == "self":
                        yield BoundMethod(attr, self)
                        continue
                yield attr
            else:
                yield attr

def function_to_method(n, klass):
    if isinstance(n, FunctionDef):
        if n.type == "classmethod":
            return bases.BoundMethod(n, klass)
        if n.type == "property":
            return n
        if n.type != "staticmethod":
            return bases.UnboundMethod(n)
    return n

def _wrap_attr(self, attrs, context=None):
        """wrap bound methods of attrs in a InstanceMethod proxies"""
        for attr in attrs:
            if isinstance(attr, UnboundMethod):
                if _is_property(attr):
                    yield from attr.infer_call_result(self, context)
                else:
                    yield BoundMethod(attr, self)
            elif hasattr(attr, "name") and attr.name == "":
                if attr.args.arguments and attr.args.arguments[0].name == "self":
                    yield BoundMethod(attr, self)
                    continue
                yield attr
            else:
                yield attr

if isinstance(attr, objects.Property):
                yield attr
                continue
            if attr.type == "classmethod":
                # If the method is a classmethod, then it will
                # be bound to the metaclass, not to the class
                # from where the attribute is retrieved.
                # get_wrapping_class could return None, so just
                # default to the current class.
                frame = get_wrapping_class(attr) or self
                yield bases.BoundMethod(attr, frame)
            elif attr.type == "staticmethod":
                yield attr
            else:
                yield bases.BoundMethod(attr, self)

yield attr
                continue

            if bases._is_property(attr):
                # TODO(cpopa): don't use a private API.
                for inferred in attr.infer_call_result(self, context):
                    yield inferred
                continue
            if attr.type == 'classmethod':
                # If the method is a classmethod, then it will
                # be bound to the metaclass, not to the class
                # from where the attribute is retrieved.
                # get_wrapping_class could return None, so just
                # default to the current class.
                frame = get_wrapping_class(attr) or self
                yield bases.BoundMethod(attr, frame)
            elif attr.type == 'staticmethod':
                yield attr
            else:
                yield bases.BoundMethod(attr, self)

for attr in bases._infer_stmts(attrs, context, frame=cls):
            if not isinstance(attr, FunctionDef):
                yield attr
                continue

            if isinstance(attr, objects.Property):
                yield attr
                continue
            if attr.type == "classmethod":
                # If the method is a classmethod, then it will
                # be bound to the metaclass, not to the class
                # from where the attribute is retrieved.
                # get_wrapping_class could return None, so just
                # default to the current class.
                frame = get_wrapping_class(attr) or self
                yield bases.BoundMethod(attr, frame)
            elif attr.type == "staticmethod":
                yield attr
            else:
                yield bases.BoundMethod(attr, self)

def function_to_method(n, klass):
    if isinstance(n, FunctionDef):
        if n.type == 'classmethod':
            return bases.BoundMethod(n, klass)
        if n.type != 'staticmethod':
            return bases.UnboundMethod(n)
    return n