Cannot call the same level library solution in pychar

disclaimer in advance: I am a student (xiaobai). If I encounter problems in the course design and solve them, I will send this post to share the method.
this article solve the problem of pycharm call library at the same level, close to measure effective

without further explanation, the above picture is

as shown above, I want to call the function in cookiespool, the importer, but it keeps going red, what is the problem?This is because the copied package is directory, and the library that Pycharm calls is Python Project, so it cannot be recognized. The solution:

as shown in the figure, labeled as sources root.

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