This inspection detects names that should resolve but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but useful number of cases. Top-level and class-level items are supported better than instance items.
上面大致意思：
import 不能識別自定義包名，該類或者包沒有灌入python引入庫中
解決方案：右擊pycharm中項目名-->Mark Directory as -->Resource root
意思：自定義的資源加入到該項目中，這樣才能被 import 識別