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I am new to emacs. I installed emacs24 which has a built-in python mode(python.el). I cannot find this file and don't know how to configure it to use python3 shell (it's using python2.7 as default). Thannks

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  • One way to find it is to do M-x customize-group RET python RET. Commented May 25, 2014 at 19:39

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M-x customize-variable RET python-shell-interpreter RET

Set it to python3. Afterwards M-x run-python RET should open a Python3 shell.

If not working yet, check $PATH, make sure the directory holding python3 executable appears.

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