How do I call a. DLL file using Python？

Question

The Python project I'm writing now requires a.dll file，After googling, I found that pythonnet is a package that references.dll files，But when I actually use it, I have a problem。Here is my code.and code file structure as shown in the picture ]21.The error is shown in Figure 2

import clr
clr.AddReference("My")
from My import *

Thank you in advance。 ps:python version:3.8.6