new_contents: """Helper script that contains many utilities.
  """
  
  
  __authors__ = [
    '"Madhusudan.C.S" <madhusudancs@gmail.com>',
    ]
  
  
  from tagging.managers import TaggedItem
  
  from pytask.taskapp.models import Task
  
  
  def remove_textbook_from_chapter():
      """Removes the tag Textbook from Chapter.
      """
  
      tasks = TaggedItem.objects.get_by_model(Task, 'Chapter')
      for task in tasks:
          tags = task.tags_field.split(',')
          retags = []
          for tag in tags:
              if 'Textbook' not in tag:
                  retags.append(tag)
          task.tags_field = ', '.join(retags)
          task.save()
  
subject: Add a utility script with a function to remove Textbook from current textbook chapter tasks.