Cannot open file [ERNO 22] INVALID ARGUMENT

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Yes now you in folder C:\Users\Joshu\python.
Type exit() to get back to command line.
If you place your python file lets call it foo.py in that folder.
You can run it like this:

C:\Users\Joshu\python\python foo.py

tutorial cmd learn basic like dir(look at files) cd(navigate to other folder).