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From the command line, I want to open an inferior Python process in a full window. I have tried: emacs --eval '(run-python)', but when Emacs opens, the *scratch* buffer is shown instead of the inferior Python process buffer. The Python process is started, but it is not the focused buffer. From the command line, how do I focus the inferior Python process in a full window when starting Emacs?

Assume that I am using GNU Emacs 26.3 with no custom configuration (i.e. emacs --no-site-file --no-init-file ...).

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  • Things within the .emacs / init.el, if any, can affect what is displayed at startup. The last hook to be called during startup (that is related to startup) is the emacs-startup-hook: gnu.org/software/emacs/manual/html_node/elisp/… One idea would be to add your function to that hook and see if that does the trick. Other things to try are using switch-to-buffer or set-window-buffer, and if there are too many windows displayed, then delete-other-windows. The startup.el cannot be modified once Emacs has been built from source; i.e., it's baked-in.
    – lawlist
    Jan 28 at 19:09
  • @lawlist Assume that I have no custom configuration (i.e. emacs --no-site-file --no-init-file ...).
    – Flux
    Jan 29 at 2:59
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I have found a solution:

emacs --eval '(progn (pop-to-buffer (process-buffer (run-python))) (delete-other-windows))'

This starts an inferior Python process, focuses it, and makes it take up the whole frame.

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