Setting up Emacs for Python
reddit / emacs

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pudentia · 2022-08-27 14:55

I have been setting up Emacs for Python use. When I build my code (by
invoking `C-c C-c`) the screen divides into two and the python
interpreter appears above my code with the cursor still in the python
file. I would like to change three things about this behavior and
would appreciate any help:

1. I would like the focus to move from the file to the interpreter.
2. I would like to remove the preamble text: `"Python 3.10.6 (main,
Aug  2 2022, 00:00:00) [GCC 12.1.1 20220507 (Red Hat 12.1.1-1)] on
linux. Type "help", "copyright", "credits" or "license" for more
information."`
3. I would like to have the interpreter start at the bottom with the
file on top.

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rrdoa · 2022-08-27 16:02

1. You might have to rebind `C-c C-c` to your own command that calls
`python-shell-send-buffer`. Here is an example (untested):

```
(defun my-python-send-shell ()
  (interactive)
  (python-shell-send-buffer)
  (python-shell-switch-to-shell))
```

3. You can configure `display-buffer-alist`:

```
(setq display-buffer-alist
      '(("\\*Python\\*"
         (display-buffer-reuse-mode-window display-buffer-below-
selected)
         (window-height . 15))))
```

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pudentia · 2022-08-27 16:32

I am not sure why, but these do not solve the three problems
identified in my post. It must be that I have a different
configuration to yours.

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rrdoa · 2022-08-27 17:07

What is your configuration? What have you tried? When I type `M-x my-
python-send-shell` as defined above, it works.

Setting `display-buffer-alist` does not work for you?

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bestlem · 2022-08-28 10:31

2 is fixable by passing the switch -q in pythons command line
https://docs.python.org/3/using/cmdline.html#miscellaneous-options

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pudentia · 2022-08-28 11:18

Thanks so much!

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jeffphil · 2022-08-28 15:53

You look like you are using built-in 'Gallina' python-mode.  I assume
OP is using https://gitlab.com/python-mode-devs/python-mode

Edit: This should be equivalent for python-mode.el:

`(defun my-python-send-shell ()
  (interactive)
  (py-shell-send-string (buffer-string))
  (py-switch-to-shell))`


Also, since the window splitting is weird for python-mode IMHO,
probably want to set this along with display-buffer-alist mentioned
above:

`(setq py-split-window-on-execute nil)`