[Tkinter] how do I enter code into python

[matelot]

I used the installer that came with it.
I can't find any way of adding the path now, is it possible without unloading and reloading the python software?
I moved the file to the same directory that python is in and made a call in CMD to there this is what I got.

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I removed the lines 4,5,6&7 as Gribouillis said earlier and I think it has worked, I now have a box called hello world.