一.現象還原：
當新建.py文件時，需要引用selenium中的方法時，報錯，提示紅波浪線：
Unresolved reference 'selenium' less... (Ctrl+F1)
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.
二.解決辦法：
1.點擊編輯器“File”->點擊“settings”
2.在“settings”中，選擇“Project：Pytest”->“Project Structre”->點擊“Add Content Root”
3.找到安裝selenium的路徑，紅色字體（例：F:\軟件\python3.6.1\Lib\site-packages），最后點擊【OK】
4.選擇selenium包的路徑，再點擊“Sources”
5.最后再“Apply”應用，再返回.py文件中就不會再提示錯誤了。