def METHOD_NAME(func, tasks, bar_width=50, file=sys.stdout, **kwargs):
    """Track the progress of tasks execution with a progress bar.
    Tasks are done with a simple for-loop.
    Args:
        func (callable): The function to be applied to each task.
        tasks (list or tuple[Iterable, int]): A list of tasks or
            (tasks, total num).
        bar_width (int): Width of progress bar.
    Returns:
        list: The task results.
    """
    if isinstance(tasks, tuple):
        assert len(tasks) == 2
        assert isinstance(tasks[0], Iterable)
        assert isinstance(tasks[1], int)
        task_num = tasks[1]
        tasks = tasks[0]
    elif isinstance(tasks, Iterable):
        task_num = len(tasks)
    else:
        raise TypeError(
            '"tasks" must be an iterable object or a (iterator, int) tuple')
    prog_bar = ProgressBar(task_num, bar_width, file=file)
    results = []
    for task in tasks:
        results.append(func(task, **kwargs))
        prog_bar.update()
    prog_bar.file.write('\n')
    return results