The idle shell window is not the same as a terminal shell (e.g. Windows search for idle click. For running python 2, all i do is activate the required conda environment and just type idle.
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To get the the idle edit window from the shell window is very simple if you know how. But i can't figure out how to do this for. It automatically opens idle for python 2.7.
Idle looks nicer, of course, and has some kind of gui.
Long answer this answer assumes python 3. Idle can be opened as an edit window or a shell window.