跟着老师敲代码，还是一直报错

  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

  File "C:\Users\Administrator\douban\douban\spiders\douban_spider.py", line 3, in <module>

    from douban.items import DoubanItem

  File "C:\Users\Administrator\douban\douban\items.py", line 11, in <module>

    class DoubanItem(scrapy.Item):

  File "C:\Users\Administrator\douban\douban\items.py", line 15, in DoubanItem

    serial_number = scrapy.field()

AttributeError: module 'scrapy' has no attribute 'field'