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How to open a python script in pcdmis?

I've got a couple basic scripts running on our programs and you simply go to INSERT > BASIC SCRIPT and chose the .bas file. But it won't let me choose a python file .py.
I tried external command and that doesn't work and I've tried INSERT > FILE I/O COMMAND > FILE OPEN, but when I run the program it runs the program without doing anything inside the python script.

How were those running some python scripts here actually getting pcdmis to open the python script?

Thanks.