pycharm print 显示红色下划线

问题

pycharm 显示红色下划线提示：

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.

解决方案

右击pycharm中项目名–>Mark Directory as -->Resource root，然后重新打开项目红线就消失了