How to use the flattentool.lib.isint function in flattentool

continue
        current_path = unflattened
        path_list = [item.rstrip("[]") for item in str(path).split("/")]
        for num, path_item in enumerate(path_list):
            if isint(path_item):
                if num == 0:
                    warn(
                        'Column "{}" has been ignored because it is a number.'.format(
                            path
                        ),
                        DataErrorWarning,
                    )
                continue
            current_type = None
            path_till_now = "/".join(
                [item for item in path_list[: num + 1] if not isint(item)]
            )
            if parser:
                current_type = parser.flattened.get(path_till_now)
            try:
                next_path_item = path_list[num + 1]
            except IndexError:
                next_path_item = ""

            # Quick solution to avoid casting of date as datetinme in spreadsheet > xml
            if xml:
                if type(cell.cell_value) == datetime.datetime and not next_path_item:
                    if "datetime" not in path:
                        current_type = "date"

            ## Array
            list_index = -1

def unflatten_main_with_parser(parser, line, timezone, xml, id_name):
    unflattened = OrderedDict()
    for path, cell in line.items():
        # Skip blank cells
        if cell.cell_value is None or cell.cell_value == "":
            continue
        current_path = unflattened
        path_list = [item.rstrip("[]") for item in str(path).split("/")]
        for num, path_item in enumerate(path_list):
            if isint(path_item):
                if num == 0:
                    warn(
                        'Column "{}" has been ignored because it is a number.'.format(
                            path
                        ),
                        DataErrorWarning,
                    )
                continue
            current_type = None
            path_till_now = "/".join(
                [item for item in path_list[: num + 1] if not isint(item)]
            )
            if parser:
                current_type = parser.flattened.get(path_till_now)
            try:
                next_path_item = path_list[num + 1]

if parser:
                current_type = parser.flattened.get(path_till_now)
            try:
                next_path_item = path_list[num + 1]
            except IndexError:
                next_path_item = ""

            # Quick solution to avoid casting of date as datetinme in spreadsheet > xml
            if xml:
                if type(cell.cell_value) == datetime.datetime and not next_path_item:
                    if "datetime" not in path:
                        current_type = "date"

            ## Array
            list_index = -1
            if isint(next_path_item):
                if current_type and current_type != "array":
                    raise ValueError(
                        "There is an array at '{}' when the schema says there should be a '{}'".format(
                            path_till_now, current_type
                        )
                    )
                list_index = int(next_path_item)
                current_type = "array"

            if current_type == "array":
                list_as_dict = current_path.get(path_item)
                if list_as_dict is None:
                    list_as_dict = ListAsDict()
                    current_path[path_item] = list_as_dict
                elif type(list_as_dict) is not ListAsDict:
                    warn(