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I do not prefer python-mode. I would like a generic way so that I can understand emacs.

I wish the file be saved and python file command then be run as if in a shell.

  • You can run a shell under emacs: M-x shell RET and execute commands in it. – NickD Jan 2 at 17:30
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Use M-! (M-x shell-command) if you want to run a shell command, e.g. python file.py and print the output in a new buffer (*Shell Command Output*). That does not open a shell in a new buffer.

Use M-x shell to run a shell in a new buffer as pointed by @NickD.

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You could use M-x compile with an appropriate compile-command value. e.g. as a file-local variable:

# -*- compile-command: "python file.py"; -*-

Emacs will prompt you to save (or not) the file before running the command.

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