How to run external cmd window with loaded Python script in R

I am looking on stackoverflow for similar topics, I found some but when I try to do it like described I am receiving error. My problem is how to from R, run external cmd window with loaded Python script? I was trying to do it like that:

system("path to Python path to my Python script")

as well as using shell function but in the end any of these commands and combinations are not working. Is there any way to run external cmd window with loaded Python script in it from R? Thank you in advance for help.

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