编写mian,py，然后运行会报错，这个怎么解决呢？

D:\douban\venv\Scripts\python.exe D:/douban/douban/main.py

Traceback (most recent call last):

  File "D:/douban/douban/main.py", line 1, in <module>

    from scrapy import cmdline

ModuleNotFoundError: No module named 'scrapy'

Process finished with exit code 1